Find the sample correlation coefficient for the following data. \[\begin{array} { | r | r | } \hline X & Y \\ \hline 3 & 8 \\ \hline 7 & 12 \\ \hline 5 & 13 \\ \hline 9 & 10 \\ \hline 11 & 17 \\ \hline 13 & 23 \\ \hline 19 & 39 \\ \hline 21 & 38 \\ \hline \end{array}\]

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

Estimate the mean exam score for the 50 students in Prof. Axolotl's class. \[\begin{array} { c r } \text { Score } & f \\ 40 \text { but less than } 50 & 6 \\ 50 \text { but less than } 60 & 18 \\ 60 \text { but less than } 70 & 14 \\ 70 \text { but less than } 80 & 9 \\ 80 \text { but less than } 90 & 3 \\ \text { Total } & 50 \end{array}\]

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

Exam 4: Descriptive Statistics

Twelve randomly chosen students were asked how many times they had missed class during a certain semester, with this result: 2, 1, 5, 1, 1, 3, 4, 3, 1, 1, 5, 18. For this sample, which measure of center is least representative of the "typical" student?

(Multiple Choice)

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Question 61

Which is a characteristic of the standard deviation?

(Multiple Choice)

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Question 62

The Empirical Rule can be applied to any distribution, unlike Chebyshev's theorem. E.R. assumes a normal population, while Chebyshev applies to any population.

(True/False)

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Question 63

The Empirical Rule assumes that the distribution of data follows a normal curve. E.R. assumes a normal population.

(True/False)

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Question 64

Based on daily measurements, Bob's weight has a mean of 200 pounds with a standard deviation of 16 pounds, while Mary's weight has a mean of 125 pounds with a standard deviation of 15 pounds. Who has the smaller relative variation?

(Multiple Choice)

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Question 65

It is inappropriate to apply the Empirical Rule to a population that is right-skewed. E.R. applies to normal populations.

(True/False)

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Question 66

The mean of a population is 50 and the median is 40. Which histogram is most likely for samples from this population?

(Multiple Choice)

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Question 67

Find the sample correlation coefficient for the following data. X Y 3 8 7 12 5 13 9 10 11 17 13 23 19 39 21 38

(Multiple Choice)

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Question 68

Estimate the mean exam score for the 50 students in Prof. Axolotl's class. Score f 40 but less than 50 6 50 but less than 60 18 60 but less than 70 14 70 but less than 80 9 80 but less than 90 3 Total 50

(Multiple Choice)

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Question 69

Find the standard deviation of this sample: 4, 7, 9, 12, 15.

(Multiple Choice)

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Question 70

A data set with two values that are tied for the highest number of occurrences is called bimodal.

(True/False)

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Question 71

Outliers are indicated using fences on a

(Multiple Choice)

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Question 72

The midhinge is a robust measure of center when there are outliers.

(True/False)

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Question 73

The ______________ shows the relationship between two variables.

(Multiple Choice)

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Question 74

Patient waiting times in the Tardis Orthopedic Clinic have a mean of 50 minutes with a standard deviation of 25 minutes. Within what range would approximately 95 percent of the waiting times lie if we were sampling a normal distribution? Do you think the distribution is likely to be normal? Explain.

(Essay)

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Question 75

Which statistics offer robust (resistant to outliers) measures of center?

(Multiple Choice)

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Question 76

The range as a measure of variability is very sensitive to extreme data values.

(True/False)

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Question 77

A certain health maintenance organization (HMO) examined the number of office visits by its members in the last year. This data set would probably be skewed to the left due to low outliers.

(True/False)

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Question 78

The athletic departments at 10 randomly selected U.S. universities were asked by the Equal Employment Opportunity Commission to state what percentage of their nursing scholarships were presently held by women. The responses were 5, 4, 2, 1, 1, 2, 10, 5, 5, 5. Find the mean, median, mode, and geometric mean. Which is the most appropriate measure of central tendency? The least appropriate? Explain your answer. Is there an outlier?

(Essay)

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Question 79

A sample consists of the following data: 7, 11, 12, 18, 20, 22, 43. Using the "three standard deviation" criterion, the last observation (X = 43) would be considered an outlier.

(True/False)

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Question 80

Showing 61 - 80 of 150

Twelve randomly chosen students were asked how many times they had missed class during a certain semester, with this result: 2, 1, 5, 1, 1, 3, 4, 3, 1, 1, 5, 18. For this sample, which measure of center is least representative of the "typical" student?

Which is a characteristic of the standard deviation?

The Empirical Rule can be applied to any distribution, unlike Chebyshev's theorem. E.R. assumes a normal population, while Chebyshev applies to any population.

The Empirical Rule assumes that the distribution of data follows a normal curve. E.R. assumes a normal population.

Based on daily measurements, Bob's weight has a mean of 200 pounds with a standard deviation of 16 pounds, while Mary's weight has a mean of 125 pounds with a standard deviation of 15 pounds. Who has the smaller relative variation?

It is inappropriate to apply the Empirical Rule to a population that is right-skewed. E.R. applies to normal populations.

The mean of a population is 50 and the median is 40. Which histogram is most likely for samples from this population?

Find the sample correlation coefficient for the following data. X Y 3 8 7 12 5 13 9 10 11 17 13 23 19 39 21 38

Estimate the mean exam score for the 50 students in Prof. Axolotl's class. Score f 40 but less than 50 6 50 but less than 60 18 60 but less than 70 14 70 but less than 80 9 80 but less than 90 3 Total 50

Find the standard deviation of this sample: 4, 7, 9, 12, 15.

A data set with two values that are tied for the highest number of occurrences is called bimodal.

Outliers are indicated using fences on a

The midhinge is a robust measure of center when there are outliers.

The ______________ shows the relationship between two variables.

Patient waiting times in the Tardis Orthopedic Clinic have a mean of 50 minutes with a standard deviation of 25 minutes. Within what range would approximately 95 percent of the waiting times lie if we were sampling a normal distribution? Do you think the distribution is likely to be normal? Explain.

Which statistics offer robust (resistant to outliers) measures of center?

The range as a measure of variability is very sensitive to extreme data values.

A certain health maintenance organization (HMO) examined the number of office visits by its members in the last year. This data set would probably be skewed to the left due to low outliers.

A sample consists of the following data: 7, 11, 12, 18, 20, 22, 43. Using the "three standard deviation" criterion, the last observation (X = 43) would be considered an outlier.

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

Time Series Analysis

Chi-Square Tests

Nonparametric Tests

Quality Management

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