Question 1

A positive kurtosis coefficient in Excel indicates a leptokurtic condition in a distribution.

Accepted Answer

A) True 
 B)False

Question 2

The median of 600,800,1000,1200 is

Accepted Answer

A) 800 
B) 1000 
C) 900 
D) 950 
A) 800 
B) 1000 
C) 900 
D) 950

Question 3

If Q1 = 150 and Q3 = 250,the upper fences (inner and outer)are

Accepted Answer

A) 450 and 600. 
B) 350 and 450. 
C) 400 and 550. 
D) impossible to determine without more information. 
A) 450 and 600. 
B) 350 and 450. 
C) 400 and 550. 
D) impossible to determine without more information.

Question 4

Here are descriptive statistics from Excel for annual per-pupil expenditures in 94 Ohio cities and home sizes in a certain neighborhood.Very briefly compare the variability and shape of the two data sets.

Accepted Answer

Expenditure per pupil is right-skewed (m

Question 5

Estimate the mean exam score for the 50 students in Prof.Axolotl's class.

Accepted Answer

A) 59.2 
B) 62.0 
C) 63.5 
D) 64.1 
A) 59.2 
B) 62.0 
C) 63.5 
D) 64.1

Question 6

The owner of a chicken farm kept track of each hen's eating and egg production for many months,with the results below.Which has more variation,feed consumption or egg output?

Accepted Answer

Feed CV = 14.3 percent,egg CV = 25.0 per

Question 7

The sum of the deviations around the mean is always zero.

Accepted Answer

A) True 
 B)False

Question 8

Which is not a characteristic of the standard deviation?

Accepted Answer

A) It is always the square root of the variance. 
B) It is not applicable when data are continuous. 
C) It can be calculated when the data contain negative or zero values. 
D) Its physical interpretation is not as easy as the MAD. 
A) It is always the square root of the variance. 
B) It is not applicable when data are continuous. 
C) It can be calculated when the data contain negative or zero values. 
D) Its physical interpretation is not as easy as the MAD.

Question 9

The ________ shows the relationship between two variables.

Accepted Answer

A) box plot 
B) bar chart 
C) histogram 
D) scatter plot 
A) box plot 
B) bar chart 
C) histogram 
D) scatter plot

Question 10

Twelve randomly chosen students were asked how many times they had missed class during a certain semester,with this result: 3,2,1,2,1,5,9,1,2,3,3,10.The median is

Accepted Answer

A) 7.0 
B) 3.0 
C) 3.5 
D) 2.5 
A) 7.0 
B) 3.0 
C) 3.5 
D) 2.5

Question 11

The coefficient of variation is

Accepted Answer

A) measured on a scale from 0 to 100. 
B) a unit-free statistic. 
C) helpful when the sample means are zero. 
D) a measure of correlation for two variables. 
A) measured on a scale from 0 to 100. 
B) a unit-free statistic. 
C) helpful when the sample means are zero. 
D) a measure of correlation for two variables.

Question 12

The mode is least appropriate for

Accepted Answer

A) continuous data. 
B) categorical data. 
C) discrete data. 
D) Likert scale data. 
A) continuous data. 
B) categorical data. 
C) discrete data. 
D) Likert scale data.

Question 13

When using Chebyshev's Theorem,the minimum percentage of sample observations that will fall within two standard deviations of the mean will be ________ the percentage within two standard deviations if a normal distribution is assumed (Empirical Rule).

Accepted Answer

A) smaller than 
B) greater than 
C) the same as 
A) smaller than 
B) greater than 
C) the same as

Question 14

Craig operates a part-time snow-plowing business using a 2002 GMC 2500 HD extended cab short box truck.This box plot of Craig's MPG on 195 tanks of gas does not support which statement?

Accepted Answer

A) There are several outliers. 
B) This is a very right-skewed distribution. 
C) Most MPG values are concentrated in a narrow range. 
D) The interquartile range is less than 2 MPG. 
A) There are several outliers. 
B) This is a very right-skewed distribution. 
C) Most MPG values are concentrated in a narrow range. 
D) The interquartile range is less than 2 MPG.

Question 15

Which of the following statements is likely to apply to the incomes of 50 randomly chosen taxpayers in California?

Accepted Answer

A) The median income would probably be near the mean. 
B) The midhinge would be a robust measure of center. 
C) The sum of squared deviations about the mean would be negative. 
D) Outliers in either tail would be equally likely. 
A) The median income would probably be near the mean. 
B) The midhinge would be a robust measure of center. 
C) The sum of squared deviations about the mean would be negative. 
D) Outliers in either tail would be equally likely.

Question 16

Exam scores in a random sample of students were 0,50,50,70,70,80,90,90,90,100.Which statement is incorrect?

Accepted Answer

A) The standard deviation is 29.61. 
B) The data are slightly left-skewed. 
C) The midrange and mean are almost the same. 
D) The third quartile is 90. 
A) The standard deviation is 29.61. 
B) The data are slightly left-skewed. 
C) The midrange and mean are almost the same. 
D) The third quartile is 90.

Question 17

For U.S.adult males,the mean height is 178 cm with a standard deviation of 8 cm and the mean weight is 84 kg with a standard deviation of 8 kg.Elmer is 170 cm tall and weighs 70 kg.It is most nearly correct to say that

Accepted Answer

A) Elmer's weight is more unusual than his height. 
B) Elmer is heavier than he is tall. 
C) Height and weight have the same degree of variation. 
D) Height has more variation than weight. 
A) Elmer's weight is more unusual than his height. 
B) Elmer is heavier than he is tall. 
C) Height and weight have the same degree of variation. 
D) Height has more variation than weight.

Question 18

Which is not an advantage of the method of medians to find Q1 and Q3?

Accepted Answer

A) Ease of interpolating quartile positions 
B) Ease of application in small data sets 
C) Intuitive definitions without complex formulas 
D) Same method as Excel's =QUARTILE.EXC function. 
A) Ease of interpolating quartile positions 
B) Ease of application in small data sets 
C) Intuitive definitions without complex formulas 
D) Same method as Excel's =QUARTILE.EXC function.

Question 19

Find the sample correlation coefficient for the following data.

Accepted Answer

A) .8911 
B) .9132 
C) .9822 
D) .9556 
A) .8911 
B) .9132 
C) .9822 
D) .9556

Question 20

A 10-point quiz was given by Professor Ennuyeaux.Of the 10 students in the class,half got zero and the others got perfect scores.List the students' scores.Then find the mean,median,mode,and geometric mean of their scores.Which is the most appropriate measure of center? The least appropriate?

Accepted Answer

0,0,0,0,0,10,10,10,10,10.Mean is 5,media

A positive kurtosis coefficient in Excel indicates a leptokurtic condition in a distribution.

The median of 600,800,1000,1200 is

If Q1 = 150 and Q3 = 250,the upper fences (inner and outer)are

Here are descriptive statistics from Excel for annual per-pupil expenditures in 94 Ohio cities and home sizes in a certain neighborhood.Very briefly compare the variability and shape of the two data sets.

Estimate the mean exam score for the 50 students in Prof.Axolotl's class.

The owner of a chicken farm kept track of each hen's eating and egg production for many months,with the results below.Which has more variation,feed consumption or egg output?

The sum of the deviations around the mean is always zero.

Which is not a characteristic of the standard deviation?

The ________ shows the relationship between two variables.

Twelve randomly chosen students were asked how many times they had missed class during a certain semester,with this result: 3,2,1,2,1,5,9,1,2,3,3,10.The median is

The coefficient of variation is

The mode is least appropriate for

When using Chebyshev's Theorem,the minimum percentage of sample observations that will fall within two standard deviations of the mean will be ________ the percentage within two standard deviations if a normal distribution is assumed (Empirical Rule).

Craig operates a part-time snow-plowing business using a 2002 GMC 2500 HD extended cab short box truck.This box plot of Craig's MPG on 195 tanks of gas does not support which statement?

Which of the following statements is likely to apply to the incomes of 50 randomly chosen taxpayers in California?

Exam scores in a random sample of students were 0,50,50,70,70,80,90,90,90,100.Which statement is incorrect?

For U.S.adult males,the mean height is 178 cm with a standard deviation of 8 cm and the mean weight is 84 kg with a standard deviation of 8 kg.Elmer is 170 cm tall and weighs 70 kg.It is most nearly correct to say that

Which is not an advantage of the method of medians to find Q1 and Q3?

Find the sample correlation coefficient for the following data.

A 10-point quiz was given by Professor Ennuyeaux.Of the 10 students in the class,half got zero and the others got perfect scores.List the students' scores.Then find the mean,median,mode,and geometric mean of their scores.Which is the most appropriate measure of center? The least appropriate?

Overview of Statistics

Data Collection

Describing Data Visually

Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions and Estimation

One-Sample Hypothesis Tests

Two-Sample Hypothesis Tests

Analysis of Variance

Simple Regression

Multiple Regression

Chi-Square Tests

Filters

Exam 4: Descriptive Statistics

A positive kurtosis coefficient in Excel indicates a leptokurtic condition in a distribution.

The median of 600,800,1000,1200 is

If Q1 = 150 and Q3 = 250,the upper fences (inner and outer)are

Here are descriptive statistics from Excel for annual per-pupil expenditures in 94 Ohio cities and home sizes in a certain neighborhood.Very briefly compare the variability and shape of the two data sets.

Estimate the mean exam score for the 50 students in Prof.Axolotl's class.

The owner of a chicken farm kept track of each hen's eating and egg production for many months,with the results below.Which has more variation,feed consumption or egg output?

The sum of the deviations around the mean is always zero.

Which is not a characteristic of the standard deviation?

The ________ shows the relationship between two variables.

Twelve randomly chosen students were asked how many times they had missed class during a certain semester,with this result: 3,2,1,2,1,5,9,1,2,3,3,10.The median is

The coefficient of variation is

The mode is least appropriate for

When using Chebyshev's Theorem,the minimum percentage of sample observations that will fall within two standard deviations of the mean will be ________ the percentage within two standard deviations if a normal distribution is assumed (Empirical Rule).

Craig operates a part-time snow-plowing business using a 2002 GMC 2500 HD extended cab short box truck.This box plot of Craig's MPG on 195 tanks of gas does not support which statement?

Which of the following statements is likely to apply to the incomes of 50 randomly chosen taxpayers in California?

Exam scores in a random sample of students were 0,50,50,70,70,80,90,90,90,100.Which statement is incorrect?

For U.S.adult males,the mean height is 178 cm with a standard deviation of 8 cm and the mean weight is 84 kg with a standard deviation of 8 kg.Elmer is 170 cm tall and weighs 70 kg.It is most nearly correct to say that

Which is not an advantage of the method of medians to find Q1 and Q3?

Find the sample correlation coefficient for the following data.

A 10-point quiz was given by Professor Ennuyeaux.Of the 10 students in the class,half got zero and the others got perfect scores.List the students' scores.Then find the mean,median,mode,and geometric mean of their scores.Which is the most appropriate measure of center? The least appropriate?

Overview of Statistics

Data Collection

Describing Data Visually

Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions and Estimation

One-Sample Hypothesis Tests

Two-Sample Hypothesis Tests

Analysis of Variance

Simple Regression

Multiple Regression

Chi-Square Tests

Filters