What is the Sample variance and standard deviation? 23 12 6 9 10

please show all steps for this practice question

sample data is included

Calculate the standard deviation and variance of the given random sample data. Round to two decimal places. x 6.9 3.2 29.9 20.7 27 13.6 PART A: WHAT IS THE Standard deviation:   PART B : WHAT IS THE Variance

just the last part, i included the sample. thank you!

Class Mean Standard Deviation Golfing Basketball 14.2 3.2 12.5 4.1

Annual starting salaries for college graduates with degrees in business administration are generally expected to be between $20,000 and $50,000. Assume that a 95% confidence interval estimate of the population mean annual starting salary is desired. a. What is the planning value for the population standard deviation? b. How large a sample should be taken if the desired margin of error is $400? Round your answers to next whole number. $190? $80? c. Would you recommend trying to obtain the $80 margin of error? Explain. Select your answer - Yes, it always better to be more accurate. No, the sample size would probably be too time consuming and costly.

A researcher with the Department of Education followed a cohort of students who graduated from high school in a certain year, monitoring the progress the students made toward completing a bachelor's degree. One aspect of his research was to determine whether students who first attended community college took longer to attain a bachelor's degree than those who immediately attended and remained at a 4-year institution. The data in the table attached below summarize the results of his study. Complete parts a) through e) below. Click here to view the sample data. Click here to view Student's t-distribution table. D. The samples are independent. E. The samples can be reasonably assumed to be random. c) Does the evidence suggest that community college transfer students take longer to attain a bachelor's degree? Use an a = 0.01 level of significance. Perform a hypothesis test. Determine the null and alternative hypotheses. O A. Ho: Hcommunity college = Hno transfer: H1: Hcommunity college…

Sample Standard deviations for sample A B C  Sample A: 7, 11, 15 Sample B: 65, 69, 73 Sample C: 1020, 1024, 1028

4