Question 11.11.When using Student's t to compute an interval estimate, ___________.(Points : 2)we use the z distributionwe assume that the samples are collected from normally distributed populationswe assume that the samples are collected from populations that are uniformlydistributedwe estimate the population mean based on the sample mean

Question 12.12.A random sample of 42 college graduates revealed that they worked anaverage of 5.5 years on the job before being promoted. The sample standard deviation was1.1 years. Using the 0.99 degree of confidence, what is the confidence interval for thepopulation mean? (Points : 2)

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Question 13.13.A university surveyed recent graduates of the English Department for theirstarting salaries. Four hundred graduates returned the survey. The average salary was$25,000, with a standard deviation of $2,500. What is the best point estimate of thepopulation mean? (Points : 2)

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Question 14.14.A university surveyed recent graduates of the English Department for theirstarting salaries. Four hundred graduates returned the survey. The average salary was$25,000. The population standard deviation was $2,500. What is the 95% confidenceinterval for the mean salary of all graduates from the English Department? (Points : 2)

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Question 15.15.A group of statistics students decided to conduct a survey at theiruniversity to find the average (mean) amount of time students spent studying per week.Assuming a population standard deviation of six hours, what is the required sample size ifthe error should be less than a half hour with a 95% level of confidence? (Points : 2)13055439335