The ages of undergraduate students at two universities (one in the east and one in the west) are being compared. Researchers want to know if there is a difference in the mean age of students at the two universities. The population standard deviations are known. The following data shows the results of samples collected at each institution: School Location n (sample size) sample mean (X )

The age of student at a university are normally distributed with a mean of 20. What percentage of the student body is at least 20 years old?

A company conducted a survey to determine the average age of its employees. The ages of 10 randomly selected employees are as follows: 25, 28, 30, 35, 40, 42, 45, 48, 50, and 55. Calculate the sample mean, sample variance, and standard deviation of the ages.

A company wants to assess the average time it takes for customers to complete a particular task on their website. They collect the following data from a sample of 10 customers: 5, 6, 7, 8, 9, 10, 10, 11, 12, 13 minutes. Calculate the sample mean and standard deviation for this data.

What is the variance and standard deviation of the following data: 8, 12, 18, 40, 42, 45, 50, 51, 60, 69, 70

Explain term refers to the standard deviation of the sampling distribution?

Consider a sample with data values of 26,24,21,19,31,35,28 and 24 . Compute the range, interquartile range, variance, and standard deviation. Round to  2 decimals, if necessary. Range   Interquartile range   Variance   Standard deviation

TLe Citu University of 3. Find the standard deviation for the following sample data: Freq. 6. 7 8. 8. 1 6. 10 4 3.

z Scores LeBron James, one of the most successful basketball players of all time, has a height of 6 feet 8 inches, or 203 cm. Based on statistics from Data Set 1 “Body Data” in Appendix B, his height converts to the z score of 4.07. How many standard deviations is his height above the mean?

what was the age distribution of prehistoric Native America? Extensive , anthropological studies in the southwestern United states gave the following information about a prehistoric extended family group of 82  members on what is now a native american reservation. for this community, estimate the mean age expressed in years, the sample variance, and the sample deviation. For the class 31 and over, use 35.5 as the class midpoint. 39,16, 20,7