STATS FINAL STUDY SET 3 EXAM QUESTIONS AND ANSWERS
Knowing the population standard deviation, a 95% confidence interval infers that the population
mean______. - CORRECT ANSWER✅✅is within +_ 1.96 standard errors of the sample mean
The distribution of Students t is - CORRECT ANSWER✅✅symmetrical
What is the difference between sample mean and population mean called? - CORRECT
ANSWER✅✅sampling error
A sample mean is the best point estimate of ____. - CORRECT ANSWER✅✅population mean
when testing the safety of cars using crash tests, a sample of one or two cars is used because. - CORRECT
ANSWER✅✅cars are destroyed
When a confidence interval for a population mean is constructed from sample data, __________. -
CORRECT ANSWER✅✅we can conclude, for an infinite number of samples and corresponding
confidence intervals, that the population mean is in a stated percentage of the intervals
A sample standard deviation is the best point estimate of the - CORRECT ANSWER✅✅population
standard deviation
How is the t-distribution similar to the z-distribution - CORRECT ANSWER✅✅both continuous
distributions
A university surveyed recent graduates of the English Department for their starting salaries. Four
hundred graduates returned the survey. The average salary was $25,000. The population standard
deviation was $2,500. What is the point estimate of the population mean? - CORRECT
ANSWER✅✅$25,000
The true sampling error is usually not known because ________. - CORRECT ANSWER✅✅mu is unkown.
Knowing the population standard deviation, a 95% confidence interval infers that the population
mean______. - CORRECT ANSWER✅✅is within +_ 1.96 standard errors of the sample mean
The distribution of Students t is - CORRECT ANSWER✅✅symmetrical
What is the difference between sample mean and population mean called? - CORRECT
ANSWER✅✅sampling error
A sample mean is the best point estimate of ____. - CORRECT ANSWER✅✅population mean
when testing the safety of cars using crash tests, a sample of one or two cars is used because. - CORRECT
ANSWER✅✅cars are destroyed
When a confidence interval for a population mean is constructed from sample data, __________. -
CORRECT ANSWER✅✅we can conclude, for an infinite number of samples and corresponding
confidence intervals, that the population mean is in a stated percentage of the intervals
A sample standard deviation is the best point estimate of the - CORRECT ANSWER✅✅population
standard deviation
How is the t-distribution similar to the z-distribution - CORRECT ANSWER✅✅both continuous
distributions
A university surveyed recent graduates of the English Department for their starting salaries. Four
hundred graduates returned the survey. The average salary was $25,000. The population standard
deviation was $2,500. What is the point estimate of the population mean? - CORRECT
ANSWER✅✅$25,000
The true sampling error is usually not known because ________. - CORRECT ANSWER✅✅mu is unkown.
