Exam 4: Descriptive Statistics

Six graduates from Fulsome University's Master's of Waste Management program were hired by a Saudi Arabian firm at $110,000 each, while the other four graduates were unemployed. The university placement office bragged, "Our MWM graduates enjoyed a median starting salary of $110,000." Is this a reasonable assessment of central tendency? What are the alternatives?

(Essay)

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Question 21

Given a sample of three items (X = 4, 6, 5), which statement is incorrect?

(Multiple Choice)

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Question 22

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, the geometric mean is:

(Multiple Choice)

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Question 23

Which Excel function would be least useful to calculate the quartiles for a column of data?

(Multiple Choice)

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Question 24

Which statement is false? Explain.

(Multiple Choice)

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Question 25

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

(Multiple Choice)

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Question 26

Which is not a measure of variability?

(Multiple Choice)

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Question 27

Patient survival times after a certain type of surgery have a very right-skewed distribution due to a few high outliers. Consequently, which statement is most likely to be correct?

(Multiple Choice)

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Question 28

Which is not a characteristic of the geometric mean as a measure of center?

(Multiple Choice)

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Question 29

Briefly describe these data. Sketch its box plot and describe the sample succinctly. Winning Margin in Rose Bowl, 1902-2000 Observations = 84 Mean = 12.89 Low = 0 Median =9.00 High =49 Midrange =24.50 5\% Trim Mean =12.00 Quartile 1 =5.0 Quartile 2 =9.0 95\% within 1 SD Quartile 3=18.0 98\% within 2 SD Std Dev =11.23 98\% within 3 SD

(Essay)

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Question 30

In a positively skewed distribution, the percentage of observations that fall below the median is:

(Multiple Choice)

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Question 31

The 25^th percentile for waiting time in a doctor's office is 10 minutes. The 75^th percentile is 30 minutes. Which is incorrect regarding the fences?

(Multiple Choice)

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Question 32

The values of x_min and x_max can be inferred accurately except in a:

(Multiple Choice)

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Question 33

Eleven students were asked how many siblings they had. The responses were 0, 1, 2, 2, 2, 2, 2, 3, 3, 4, 5. Find the mean, median, mode, and geometric mean. Which would you prefer in this case, and why not the others?

(Short Answer)

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Question 34

Which distribution is least likely to be skewed to the right by high values?

(Multiple Choice)

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Question 35

The second quartile is the same as the median.

(True/False)

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Question 36

The mode is least appropriate for:

(Multiple Choice)

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Question 37

Three randomly chosen California students were asked how many times they drove to Mexico last year. Their replies were 4, 5, 6. The geometric mean is:

(Multiple Choice)

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Question 38

Exam scores in a small class were 0, 50, 50, 70, 70, 80, 90, 90, 100, 100. For this data set, which statement is incorrect concerning measures of center?

(Multiple Choice)

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Question 39

If Excel's sample skewness coefficient is positive, we conclude that

(Multiple Choice)

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Question 40

Showing 21 - 40 of 150

Given a sample of three items (X = 4, 6, 5), which statement is incorrect?

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, the geometric mean is:

Which Excel function would be least useful to calculate the quartiles for a column of data?

Which statement is false? Explain.

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

Which is not a measure of variability?

Patient survival times after a certain type of surgery have a very right-skewed distribution due to a few high outliers. Consequently, which statement is most likely to be correct?

Which is not a characteristic of the geometric mean as a measure of center?

In a positively skewed distribution, the percentage of observations that fall below the median is:

The 25^th percentile for waiting time in a doctor's office is 10 minutes. The 75^th percentile is 30 minutes. Which is incorrect regarding the fences?

The values of x_min and x_max can be inferred accurately except in a:

Eleven students were asked how many siblings they had. The responses were 0, 1, 2, 2, 2, 2, 2, 3, 3, 4, 5. Find the mean, median, mode, and geometric mean. Which would you prefer in this case, and why not the others?

Which distribution is least likely to be skewed to the right by high values?

The second quartile is the same as the median.

The mode is least appropriate for:

Three randomly chosen California students were asked how many times they drove to Mexico last year. Their replies were 4, 5, 6. The geometric mean is:

Exam scores in a small class were 0, 50, 50, 70, 70, 80, 90, 90, 100, 100. For this data set, which statement is incorrect concerning measures of center?

If Excel's sample skewness coefficient is positive, we conclude that

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

Filters

Exam 4: Descriptive Statistics

Given a sample of three items (X = 4, 6, 5), which statement is incorrect?

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, the geometric mean is:

Which Excel function would be least useful to calculate the quartiles for a column of data?

Which statement is false? Explain.

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

Which is not a measure of variability?

Patient survival times after a certain type of surgery have a very right-skewed distribution due to a few high outliers. Consequently, which statement is most likely to be correct?

Which is not a characteristic of the geometric mean as a measure of center?

In a positively skewed distribution, the percentage of observations that fall below the median is:

The 25th percentile for waiting time in a doctor's office is 10 minutes. The 75th percentile is 30 minutes. Which is incorrect regarding the fences?

The values of xmin and xmax can be inferred accurately except in a:

Eleven students were asked how many siblings they had. The responses were 0, 1, 2, 2, 2, 2, 2, 3, 3, 4, 5. Find the mean, median, mode, and geometric mean. Which would you prefer in this case, and why not the others?

Which distribution is least likely to be skewed to the right by high values?

The second quartile is the same as the median.

The mode is least appropriate for:

Three randomly chosen California students were asked how many times they drove to Mexico last year. Their replies were 4, 5, 6. The geometric mean is:

Exam scores in a small class were 0, 50, 50, 70, 70, 80, 90, 90, 100, 100. For this data set, which statement is incorrect concerning measures of center?

If Excel's sample skewness coefficient is positive, we conclude that

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

Filters

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

The 25^th percentile for waiting time in a doctor's office is 10 minutes. The 75^th percentile is 30 minutes. Which is incorrect regarding the fences?

The values of x_min and x_max can be inferred accurately except in a: