Standard Deviation

Question 1

A poll worker analyzing the ages of voters found that and . What is a possible voter age that would give her zx = 1.14? Round your answer to the nearest whole number.

Revolt · Accepted Answer

C: 71

Question 2

Yuri computes the mean and standard deviation for the sample data set 12, 14, 9, and 21. He finds the mean is 14. His steps for finding the standard deviation are below.What is the first error he made in computing the standard deviation?

Revolt · Accepted Answer

B: Yuri divided by n instead of n -1.

Question 3

A scientist collected two sample sets of snowfall data. Which statistic should he use to compare the spread of the two sets of data?

Revolt · Accepted Answer

D: standard deviation

Question 4

The mean ages with standard deviations of four swim teams at a swim club are given below.TeamMeanStandard DeviationStars164.1Dolphins181.5Giants140.3Mackerels152.3Which statement is most likely to be true?

Revolt · Accepted Answer

B: The ages of the Stars are the most dispersed from the team’s mean.

Question 5

Fiona recorded the number of miles she biked each day last week as shown below.4, 7, 4, 10, 5The mean is given by m = 6. Which equation shows the variance for the number of miles Fiona biked last week?

Revolt · Accepted Answer

D: Sigma squared = StartFraction (4 minus 6) squared + (7 minus 6) squared + (4 minus 6) squared + (10 minus 6) squared + (5 minus 6) squared Over 5 EndFraction

Question 6

Mrs. Rodrigues wants to compare the spread of the test scores of her two biology classes. Which statistic should she use?

Revolt · Accepted Answer

B: standard deviation

Question 7

Abby is collecting rainfall data. She finds that one value of the data set is a high-value outlier. Which statement must be true?

Revolt · Accepted Answer

B: The outlier will increase the standard deviation of the data set.

Question 8

The monthly mean salaries and standard deviations of four college students are given below.StudentMeanStandard DeviationClarissa$34512.53Abi$5988.99Kaila$81215.29Shenika$2087.67Which statement must be true?

Revolt · Accepted Answer

A: The monthly salary of Shenika is less spread out than the monthly salary of Clarissa.

Question 9

A missing data value from a set of data has a z-score of –2.1. Fred already calculated the mean and standard deviation to be and . What was the missing data value? Round the answer to the nearest whole number.

Revolt · Accepted Answer

A: 39

Question 10

The number of cars sold at a dealership over several weeks is given below.14, 23, 31, 29, 33What is the standard deviation for this set of population data?Standard deviation:

Revolt · Accepted Answer

A: 6.9

Standard Deviation Answers

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