standard deviation

The weekly salaries of a sample of employees at the local bank are given in the table below. What is the variance for the data?

17,507.5

The test scores of a geometry class are given below. 90, 75, 72, 88, 85 The teacher wants to find the variance for the class population. What is the value of the numerator of the calculation of the variance?

258

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 u=43 and o=2 What was the missing data value? Round the answer to the nearest whole number.

39

A poll worker analyzing the ages of voters found that u-65 and o=5. What is a possible voter age that would give her zx = 1.14? Round your answer to the nearest whole number.

71

The mean of a set of credit scores is u=690 and o=14. Which credit score is within a z-score of 3.3?

720

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

standard deviation

The monthly mean salaries and standard deviations of four college students are given below. which statement must be true

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

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. =sqrt19.5 first error

Yuri divided by n instead of n -1.

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

a

Which formula is used to calculate the standard deviation of sample data?

a

A set of data has a mean of 0.5 and a standard deviation of 0.01. A data point of the set has a z-score of 2.5. What does a z-score of 2.5 mean?

d

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

d

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

standard deviation