What is the critical t* needed to construct a 90% confidence interval for a population mean when n = 20?

Given a population standard deviation of = 7, what is the minimum sample size needed to estimate the population mean to within 2 with a 98% level of confidence?

A random sample of 100 individuals finds a sample mean value of 22 and sample standard deviation of 3. What is the 99% confidence interval for the population mean?

The critical value for a two-tailed hypothesis test with a level of significance of = 0.05 when a standardized test statistic has a standard normal distribution is z* =

A hypothesis test is conducted with H0 : = -25 vs. Ha: > -25. The hypothesis test sample findsx = -23.6, s = 3, and n = 16 . Within which interval does the tail area P lie?

A random sample of 225 likely voters in one state finds 52% of them favor the incumbent candidate in an upcoming election. What is the 99% confidence interval for the proportion of voters that favor the incumbent candidate?

A random sample of 81 individuals finds a sample mean value of 65 and sample standard deviation of 4.5. What is the 95% confidence interval for the population mean?

Which alternative hypothesis is used for a right-tailed test?

What is the critical value z*needed to construct a 98% confidence interval?

In the most recent census it was found 65% of those living in one state owned their own home. What sample size is needed to construct the 95% confidence interval to within 0.04 ?

A random sample of 16 individuals finds a sample mean value of 32 and sample standard deviation of 12. What is the 90% confidence interval for the population mean?

The critical value for a right-tailed hypothesis test with a level of significance of = 0.01 when a standardized test statistic has a standard normal distribution is z* =

A hypothesis test is conducted with H0 : = 46 vs. Ha: 46. The hypothesis test sample finds x = 47.2, s = 5, and n = 81. The tail area in this test is P =

A hypothesis test is conducted with H0 : = 18 vs. Ha: > 18. Given that the population is normal and the sample finds x = 21.2, = 10, and n = 9 , the tail area of this test is P =