Question 1

Using grouped data of 14 classes with a sample mean of 51 and a sample variance of 6.42,calculate the group sampled standard deviation.

Accepted Answer

2.53
Feedb

Question 2

Data summarized in a frequency distribution or histogram form are often called weighted data.

Accepted Answer

A) True 
 B)False

Question 3

In the calculation of a mean for grouped data,___________ and ___________ are used.

Accepted Answer

A) Total sample size,sum of the midpoints of each class 
B) Total sample size,sum of the weighted midpoints 
C) Sum of the frequency of each class,the sum of the midpoints of each class 
D) Sum of the frequency of each class,the sample midpoint 
A) Total sample size,sum of the midpoints of each class 
B) Total sample size,sum of the weighted midpoints 
C) Sum of the frequency of each class,the sum of the midpoints of each class 
D) Sum of the frequency of each class,the sample midpoint

Question 4

A quantity that measures the variation of a population or a sample relative to its mean is called the ____________.

Accepted Answer

A) Range 
B) Standard deviation 
C) Coefficient of variation 
D) Variance 
E) Interquartile range 
A) Range 
B) Standard deviation 
C) Coefficient of variation 
D) Variance 
E) Interquartile range

Question 5

Another name for the 50th percentile is the ___________.

Accepted Answer

A) Mean 
B) First quartile 
C) Median 
D) Mode 
E) Third quartile 
A) Mean 
B) First quartile 
C) Median 
D) Mode 
E) Third quartile

Question 6

The local amusement park was interested in the average wait time at their most popular roller coaster at the peak park time (2 p.m. ).They selected 13 patrons and had them get in line between 2 and 3 p.m.Each was given a stopwatch to record the time they spent in line.The times recorded were as follows (in minutes).
118,124,108,116,99,120,148,118,119,121,45,130,118
What is the mode?

Accepted Answer

A) 114.15 
B) 118 
C) 148 
D) 45 
E) 115.5 
A) 114.15 
B) 118 
C) 148 
D) 45 
E) 115.5

Question 7

Quality control is an important issue at ACME Company,which manufactures light bulbs.To test the life-hours of their light bulbs,they randomly sampled nine light bulbs and measured how many hours they lasted (mean = 346.6).
378,361,350,375,200,391,375,368,321
What is the standard deviation?

Accepted Answer

A) 342.43 
B) 3424.3 
C) 58.5 
D) 191 
E) 10,609 
A) 342.43 
B) 3424.3 
C) 58.5 
D) 191 
E) 10,609

Question 8

In the least squares line,___________ is defined as rise/run.

Accepted Answer

A) Correlation coefficient 
B) Predicted value of y 
C) Y-intercept 
D) Slope 
A) Correlation coefficient 
B) Predicted value of y 
C) Y-intercept 
D) Slope

Question 9

Quality control is an important issue at ACME Company,which manufactures light bulbs.To test the life-hours of their light bulbs,they randomly sampled nine light bulbs and measured how many hours they lasted.
378,361,350,375,200,391,375,368,321
What is the median?

Accepted Answer

A) 375 
B) 368 
C) 389.9 
D) 200 
E) 346.6 
A) 375 
B) 368 
C) 389.9 
D) 200 
E) 346.6

Question 10

The point estimate of the _______________ is the positive square root of the sample variance.

Accepted Answer

A) Sample mean 
B) Sample standard deviation 
C) Range 
D) Median 
E) Population standard deviation 
A) Sample mean 
B) Sample standard deviation 
C) Range 
D) Median 
E) Population standard deviation

Question 11

Which percentile describes the first quartile,Q1?

Accepted Answer

A) 25th 
B) 50th 
C) 75th 
D) 100th 
A) 25th 
B) 50th 
C) 75th 
D) 100th

Question 12

The company financial officer was interested in the average cost of PCs that had been purchased in the past six months.She took a random sample of the price of 10 computers,with the following results.
$3,250,$1,127,$2,995,$3,250,$3,445,$3,449,$1,482,$6,120,$3,009,$4,000
What is the first quartile?

Accepted Answer

A) $1,446.50 
B) $2,995.00 
C) $3,415.75 
D) $3,587.00 
E) $4,212.00 
A) $1,446.50 
B) $2,995.00 
C) $3,415.75 
D) $3,587.00 
E) $4,212.00

Question 13

When using Chebyshev's Theorem to obtain the bounds for 99.73 percent of the values in a population,the interval generally will be ___________ the interval obtained for the same percentage if a normal distribution is assumed (Empirical Rule).

Accepted Answer

A) Shorter than 
B) Wider than 
C) The same as 
A) Shorter than 
B) Wider than 
C) The same as

Question 14

In a statistics class,10 scores were randomly selected with the following results (mean = 71.5):
74,73,77,77,71,68,65,77,67,66
What is the standard deviation?

Accepted Answer

A) 22.72 
B) 12.00 
C) 4.77 
D) 516.20 
E) 144.00 
A) 22.72 
B) 12.00 
C) 4.77 
D) 516.20 
E) 144.00

Question 15

In a statistics class,10 scores were randomly selected with the following results:
74,73,77,77,71,68,65,77,67,66
What is the first quartile?

Accepted Answer

A) 65.9 
B) 67.3 
C) 67.0 
D) 73.85 
E) 77.0 
A) 65.9 
B) 67.3 
C) 67.0 
D) 73.85 
E) 77.0

Question 16

From the following table of values and corresponding sample sizes,calculate the weighted mean.

Accepted Answer

4.1
Feedback:(3.1 ×

Question 17

The company financial officer was interested in the average cost of PCs that had been purchased in the past six months.She took a random sample of the price of 10 computers,with the following results.
$3,250,$1,127,$2,995,$3,250,$3,445,$3,449,$1,482,$6,120,$3,009,$4,000
What are the lower and upper limits?

Accepted Answer

A) 2541,3903 
B) 2768,3676 
C) 2087,4357 
D) 2314,4130 
E) 1633,2087 
A) 2541,3903 
B) 2768,3676 
C) 2087,4357 
D) 2314,4130 
E) 1633,2087

Question 18

Find the weighted mean per capita income for the following random sample of six cities in the Midwest.
$\begin{array}{|l|r|r|}
\hline \text { City } & \text { Population }&\text { Per Capita Income } \
\hline \text { A } & 540,000 &\$26,338  \
\hline \text { B } & 1,250,000 &\$ 28,455  \
\hline \text { C } & 325,000 &\$  36,574 \
\hline \text { D } & 2,461,000 &\$  33,690 \
\hline \text { E } & 845,000&\$  31,998  \
\hline \text { F } & 620,000&\$ 29,442 \
\hline
\end{array}$

Accepted Answer

None

Question 19

The constant return used to forecast future wealth based on actual time periods and their returns is the ____________.

Accepted Answer

A) Grouped mean 
B) Geometric mean 
C) Weighted mean 
D) Arithmetic mean 
A) Grouped mean 
B) Geometric mean 
C) Weighted mean 
D) Arithmetic mean

Question 20

According to Chebyshev's Theorem,at least what proportion of the data will be within µ ± kσ for k = 2

Accepted Answer

A) 68% 
B) 50% 
C) 25% 
D) 75% 
E) 34% 
A) 68% 
B) 50% 
C) 25% 
D) 75% 
E) 34%

Using grouped data of 14 classes with a sample mean of 51 and a sample variance of 6.42,calculate the group sampled standard deviation.

Data summarized in a frequency distribution or histogram form are often called weighted data.

In the calculation of a mean for grouped data,_ and _ are used.

A quantity that measures the variation of a population or a sample relative to its mean is called the ____________.

Another name for the 50^th percentile is the ___________.

Quality control is an important issue at ACME Company,which manufactures light bulbs.To test the life-hours of their light bulbs,they randomly sampled nine light bulbs and measured how many hours they lasted (mean = 346.6). 378,361,350,375,200,391,375,368,321 What is the standard deviation?

In the least squares line,___________ is defined as rise/run.

Quality control is an important issue at ACME Company,which manufactures light bulbs.To test the life-hours of their light bulbs,they randomly sampled nine light bulbs and measured how many hours they lasted. 378,361,350,375,200,391,375,368,321 What is the median?

The point estimate of the _______________ is the positive square root of the sample variance.

Which percentile describes the first quartile,Q₁?

The company financial officer was interested in the average cost of PCs that had been purchased in the past six months.She took a random sample of the price of 10 computers,with the following results. $3,250,$1,127,$2,995,$3,250,$3,445,$3,449,$1,482,$6,120,$3,009,$4,000 What is the first quartile?

When using Chebyshev's Theorem to obtain the bounds for 99.73 percent of the values in a population,the interval generally will be ___________ the interval obtained for the same percentage if a normal distribution is assumed (Empirical Rule).

In a statistics class,10 scores were randomly selected with the following results (mean = 71.5): 74,73,77,77,71,68,65,77,67,66 What is the standard deviation?

In a statistics class,10 scores were randomly selected with the following results: 74,73,77,77,71,68,65,77,67,66 What is the first quartile?

From the following table of values and corresponding sample sizes,calculate the weighted mean.

Find the weighted mean per capita income for the following random sample of six cities in the Midwest. City Population Per Capita Income A 540,000 \2 6,338 B 1,250,000 \ 28,455 C 325,000 \ 36,574 D 2,461,000 \ 33,690 E 845,000 \ 31,998 F 620,000 \ 29,442

The constant return used to forecast future wealth based on actual time periods and their returns is the ____________.

According to Chebyshev's Theorem,at least what proportion of the data will be within µ ± kσ for k = 2

An Introduction to Business Statistics

Descriptive Statistics: Tabular and Graphical Methods

Probability

Discrete Random Variables

Continuous Random Variables

Sampling and Sampling Distributions

Confidence Intervals

Hypothesis Testing

Comparing Two Means and Two Proportions

Filters

Exam 3: Descriptive Statistics: Numerical Methods

Using grouped data of 14 classes with a sample mean of 51 and a sample variance of 6.42,calculate the group sampled standard deviation.

Data summarized in a frequency distribution or histogram form are often called weighted data.

In the calculation of a mean for grouped data,___________ and ___________ are used.

A quantity that measures the variation of a population or a sample relative to its mean is called the ____________.

Another name for the 50th percentile is the ___________.

Quality control is an important issue at ACME Company,which manufactures light bulbs.To test the life-hours of their light bulbs,they randomly sampled nine light bulbs and measured how many hours they lasted (mean = 346.6). 378,361,350,375,200,391,375,368,321 What is the standard deviation?

In the least squares line,___________ is defined as rise/run.

Quality control is an important issue at ACME Company,which manufactures light bulbs.To test the life-hours of their light bulbs,they randomly sampled nine light bulbs and measured how many hours they lasted. 378,361,350,375,200,391,375,368,321 What is the median?

The point estimate of the _______________ is the positive square root of the sample variance.

Which percentile describes the first quartile,Q1?

The company financial officer was interested in the average cost of PCs that had been purchased in the past six months.She took a random sample of the price of 10 computers,with the following results. $3,250,$1,127,$2,995,$3,250,$3,445,$3,449,$1,482,$6,120,$3,009,$4,000 What is the first quartile?

When using Chebyshev's Theorem to obtain the bounds for 99.73 percent of the values in a population,the interval generally will be ___________ the interval obtained for the same percentage if a normal distribution is assumed (Empirical Rule).

In a statistics class,10 scores were randomly selected with the following results (mean = 71.5): 74,73,77,77,71,68,65,77,67,66 What is the standard deviation?

In a statistics class,10 scores were randomly selected with the following results: 74,73,77,77,71,68,65,77,67,66 What is the first quartile?

From the following table of values and corresponding sample sizes,calculate the weighted mean.

Find the weighted mean per capita income for the following random sample of six cities in the Midwest. City Population Per Capita Income A 540,000 \2 6,338 B 1,250,000 \ 28,455 C 325,000 \ 36,574 D 2,461,000 \ 33,690 E 845,000 \ 31,998 F 620,000 \ 29,442

The constant return used to forecast future wealth based on actual time periods and their returns is the ____________.

According to Chebyshev's Theorem,at least what proportion of the data will be within µ ± kσ for k = 2

An Introduction to Business Statistics

Descriptive Statistics: Tabular and Graphical Methods

Probability

Discrete Random Variables

Continuous Random Variables

Sampling and Sampling Distributions

Confidence Intervals

Hypothesis Testing

Comparing Two Means and Two Proportions

Filters

In the calculation of a mean for grouped data,_ and _ are used.

Another name for the 50^th percentile is the ___________.

Which percentile describes the first quartile,Q₁?