Question 1

Data Set 3-5: 5, 1, 2, 1, 1, 5
-The median for Data Set 3-5 is

Accepted Answer

A)  1 
B)  1.5 
C)  2 
D)  15. 
A)  1 
B)  1.5 
C)  2 
D)  15.

Question 2

The mean salary for all those with a Bachelors degree was $40,000; for all those with Masters degrees, $60,000; and for all those with doctorates, $80,000. The weighted mean salary will be

Accepted Answer

A)  $60,000 
B)  less than $60,000 
C)  more than $60,000. 
A)  $60,000 
B)  less than $60,000 
C)  more than $60,000.

Question 3

At Wassamatta U. the GPA for seniors is 3.50; for juniors, 3.00; sophomores 2.50 and freshmen 1.50. What is the weighted GPA at Wassamatta U. (careful on this one)?

Accepted Answer

The weighted grade point avera

Question 4

If the mean of 7, 4, 4 is 5.0 and the mean of 14, 3, 7, 4 is 7.0, the weighted mean i

Accepted Answer

A)  6.0 
B)  21.5 
C)  4 
D)  none of the other alternatives are correct. 
A)  6.0 
B)  21.5 
C)  4 
D)  none of the other alternatives are correct.

Question 5

Find the median of each distribution below.
-$$\begin{array} { l l } 
X & f \
\hline 8 & 3 \
7 & 6 \
6 & 7 \
5 & 6 \
4 & 1
\end{array}$$

Accepted Answer

\[\begin{array} { l } 
\mathrm

Question 6

For a negatively skewed curve, the usual case with continuous data is that

Accepted Answer

A)  high scores are more frequent than low scores and the mean is greater than the median 
B)  low scores are more frequent than high scores and the mean is greater than the median 
C)  high scores are more frequent than low scores and the median is greater than the mean 
D)  low scores are more frequent than high scores and the median is greater than the mean. 
A)  high scores are more frequent than low scores and the mean is greater than the median 
B)  low scores are more frequent than high scores and the mean is greater than the median 
C)  high scores are more frequent than low scores and the median is greater than the mean 
D)  low scores are more frequent than high scores and the median is greater than the mean.

Question 7

In an election Smith received 30 votes, Johnson 26, Williams 29, Jones 19, Brown 17, and Davis 31. (Smith is the most common name in the U.S., followed by Johnson, etc.) What is the mode of the distribution above?

Accepted Answer

A)  6 
B)  31 
C)  Jones 
D)  none of the other alternatives are correct. 
A)  6 
B)  31 
C)  Jones 
D)  none of the other alternatives are correct.

Question 8

For continuous data that are negatively skewed, the mean is usually smaller than the median.

Accepted Answer

A) True 
 B)False

Question 9

Find the mean, median, and mode and tell the direction of skew, if any. $$\begin{array} { l l } 
X & f \
\hline 7 & 1 \
6 & 0 \
5 & 2 \
4 & 3 \
3 & 4 \
2 & 5
\end{array}$$

Accepted Answer

None

Question 10

Find the median of each distribution below.
-$$\begin{array} { l l } 
X & f \
\hline 105 & 3 \
104 & 4 \
103 & 7 \
102 & 2 \
101 & 5 \
100 & 3
\end{array}$$

Accepted Answer

\[\begin{array} { l } 
\mathrm

Question 11

Data Set 3-2: 5, 5, 1, 4, 4, 5
-The mean of Data Set 3-2 is

Accepted Answer

A)  5 
B)  4.5 
C)  4 
D)  24. 
A)  5 
B)  4.5 
C)  4 
D)  24.

Question 12

Suppose a distribution of scores had a mean of -6 and a median of +6. In the usual case for continuous data, you would conclude

Accepted Answer

A)  the distribution is positively skewed 
B)  the distribution is negatively skewed 
C)  nothing about skewness unless additional information is given 
D)  that such scores are logically impossible. 
A)  the distribution is positively skewed 
B)  the distribution is negatively skewed 
C)  nothing about skewness unless additional information is given 
D)  that such scores are logically impossible.

Question 13

Data Set 3-1 - CD A student was interested in the structure of the families in the U.S. He sampled 29 of his 330 classmates asking the question, "How many children are there in your family?" He compiled the answers into a simple frequency distribution:
 $$\begin{array} { l r } 
X & f \
\hline 7 & 1 \
5 & 2 \
4 & 3 \
3 & 6 \
2 & 10 \
1 & 7
\end{array}$$
-Refer to Data Set 3-1. The median is

Accepted Answer

A)  5 
B)  3.5 
C)  3 
D)  2. 
A)  5 
B)  3.5 
C)  3 
D)  2.

Question 14

The mean temperature for June was 70$\degree$F, for July it was 75$\degree$F, and for August it was 80$\degree$F. You should conclude that the overall mean for the three months is

Accepted Answer

A)  75$\degree$F 
B)  more than 75$\degree$F 
C)  less than 75$\degree$F. 
A)  75$\degree$F 
B)  more than 75$\degree$F 
C)  less than 75$\degree$F.

Question 15

For scores of 8, 10, 8, 9, 8, 8, 9, 8, the median is

Accepted Answer

A)  8 
B)  9 
C)  4 
D)  13.5. 
A)  8 
B)  9 
C)  4 
D)  13.5.

Question 16

For ordinal data, a median is an appropriate measure of central tendency.

Accepted Answer

A) True 
 B)False

Question 17

Suppose means of 10, 14, 9, and 11 were obtained from samples of 3, 5, 2, and 8 respectively. Find the weighted mean.

Accepted Answer

\[\begin{array}{l}
\begin{array} { r r r

Question 18

For which situation below is the mean the appropriate measure of central tendency?

Accepted Answer

A)  the number of hours completed by college graduates, with categories of 120-129, 130-139, 140-149, 150-159, 160 and over. 
B)  the birds sighted on the annual Audubon bird count, with categories of blue jay, purple finch, scarlet tanager, crow, etc. 
C)  reaction time in stepping on the brake of a car when danger looms. This distribution is quite skewed 
D)  none of the other alternatives are correct. 
A)  the number of hours completed by college graduates, with categories of 120-129, 130-139, 140-149, 150-159, 160 and over. 
B)  the birds sighted on the annual Audubon bird count, with categories of blue jay, purple finch, scarlet tanager, crow, etc. 
C)  reaction time in stepping on the brake of a car when danger looms. This distribution is quite skewed 
D)  none of the other alternatives are correct.

Question 19

A distribution cannot have two modes.

Accepted Answer

A) True 
 B)False

Question 20

The overall mean of 2 samples with different Ns requires the formula for the weighted mean.

Accepted Answer

A) True 
 B)False

Data Set 3-5: 5, 1, 2, 1, 1, 5 -The median for Data Set 3-5 is

The mean salary for all those with a Bachelors degree was $40,000; for all those with Masters degrees, $60,000; and for all those with doctorates, $80,000. The weighted mean salary will be

At Wassamatta U. the GPA for seniors is 3.50; for juniors, 3.00; sophomores 2.50 and freshmen 1.50. What is the weighted GPA at Wassamatta U. (careful on this one)?

If the mean of 7, 4, 4 is 5.0 and the mean of 14, 3, 7, 4 is 7.0, the weighted mean i

Find the median of each distribution below. - X f 8 3 7 6 6 7 5 6 4 1

For a negatively skewed curve, the usual case with continuous data is that

In an election Smith received 30 votes, Johnson 26, Williams 29, Jones 19, Brown 17, and Davis 31. (Smith is the most common name in the U.S., followed by Johnson, etc.) What is the mode of the distribution above?

For continuous data that are negatively skewed, the mean is usually smaller than the median.

Find the mean, median, and mode and tell the direction of skew, if any. X f 7 1 6 0 5 2 4 3 3 4 2 5

Find the median of each distribution below. - X f 105 3 104 4 103 7 102 2 101 5 100 3

Data Set 3-2: 5, 5, 1, 4, 4, 5 -The mean of Data Set 3-2 is

Suppose a distribution of scores had a mean of -6 and a median of +6. In the usual case for continuous data, you would conclude

The mean temperature for June was 70 $\degree$ F, for July it was 75 $\degree$ F, and for August it was 80 $\degree$ F. You should conclude that the overall mean for the three months is

For scores of 8, 10, 8, 9, 8, 8, 9, 8, the median is

For ordinal data, a median is an appropriate measure of central tendency.

Suppose means of 10, 14, 9, and 11 were obtained from samples of 3, 5, 2, and 8 respectively. Find the weighted mean.

For which situation below is the mean the appropriate measure of central tendency?

A distribution cannot have two modes.

The overall mean of 2 samples with different Ns requires the formula for the weighted mean.

Introduction

Exploring Data: Frequency Distributions and Graphs

Exploring Data: Variability

Other Descriptive Statistics

Correlation and Regression

Theoretical Distributions Including the Normal Distribution

Samples, Sampling Distributions, and Confidence Intervals

Hypothesis Testing and Effect Size: One-Sample Designs

Hypothesis Testing, Effect Size, and and Confidence Intervals: Two-Sample Designs

Analysis of Variance: One-Way Classification

Analysis of Variance: One-Factor Repeated Measures

Analysis of Variance: Factorial Design

Chi Square Tests

More Nonparametric Tests

Appendix: Grouped Frequency Distributions and Central Tendency

Filters

Exam 3: Exploring Data: Central Tendency

Data Set 3-5: 5, 1, 2, 1, 1, 5 -The median for Data Set 3-5 is

The mean salary for all those with a Bachelors degree was $40,000; for all those with Masters degrees, $60,000; and for all those with doctorates, $80,000. The weighted mean salary will be

At Wassamatta U. the GPA for seniors is 3.50; for juniors, 3.00; sophomores 2.50 and freshmen 1.50. What is the weighted GPA at Wassamatta U. (careful on this one)?

If the mean of 7, 4, 4 is 5.0 and the mean of 14, 3, 7, 4 is 7.0, the weighted mean i

Find the median of each distribution below. - X f 8 3 7 6 6 7 5 6 4 1

For a negatively skewed curve, the usual case with continuous data is that

In an election Smith received 30 votes, Johnson 26, Williams 29, Jones 19, Brown 17, and Davis 31. (Smith is the most common name in the U.S., followed by Johnson, etc.) What is the mode of the distribution above?

For continuous data that are negatively skewed, the mean is usually smaller than the median.

Find the mean, median, and mode and tell the direction of skew, if any. X f 7 1 6 0 5 2 4 3 3 4 2 5

Find the median of each distribution below. - X f 105 3 104 4 103 7 102 2 101 5 100 3

Data Set 3-2: 5, 5, 1, 4, 4, 5 -The mean of Data Set 3-2 is

Suppose a distribution of scores had a mean of -6 and a median of +6. In the usual case for continuous data, you would conclude

The mean temperature for June was 70 °\degree° F, for July it was 75 °\degree° F, and for August it was 80 °\degree° F. You should conclude that the overall mean for the three months is

For scores of 8, 10, 8, 9, 8, 8, 9, 8, the median is

For ordinal data, a median is an appropriate measure of central tendency.

Suppose means of 10, 14, 9, and 11 were obtained from samples of 3, 5, 2, and 8 respectively. Find the weighted mean.

For which situation below is the mean the appropriate measure of central tendency?

A distribution cannot have two modes.

The overall mean of 2 samples with different Ns requires the formula for the weighted mean.

Introduction

Exploring Data: Frequency Distributions and Graphs

Exploring Data: Variability

Other Descriptive Statistics

Correlation and Regression

Theoretical Distributions Including the Normal Distribution

Samples, Sampling Distributions, and Confidence Intervals

Hypothesis Testing and Effect Size: One-Sample Designs

Hypothesis Testing, Effect Size, and and Confidence Intervals: Two-Sample Designs

Analysis of Variance: One-Way Classification

Analysis of Variance: One-Factor Repeated Measures

Analysis of Variance: Factorial Design

Chi Square Tests

More Nonparametric Tests

Appendix: Grouped Frequency Distributions and Central Tendency

Filters

The mean temperature for June was 70 $\degree$ F, for July it was 75 $\degree$ F, and for August it was 80 $\degree$ F. You should conclude that the overall mean for the three months is