The manager of a large hotel must decide whether to hire additional front desk staff. he has decided to hire more staff if there is evidence that the average time customers must wait in line before beings assisted with check-in is greater than 3 minutes. he decides to test h0: µ = 3 versus h0: µ> 3. which of the following would be a consequence of type ii error?

a) decided not to hire additional staff when the wait time really is greater than 3 minutes.
b) deciding not to hire additional staff when the waiter time really is not greater than 3 minutes
c) deciding to hire additional staff when the wait time really is greater than 3 minutes.
d) deciding to hire additional staff when the wait time really is not greater than 3 minutes.
e) deciding that a wait time of greater than 3 minutes is acceptable.

According to a research study, parents with young children slept 6.4 hours each night last year, on average. a random sample of 18 parents with young children was surveyed and the mean amount of time per night each parent slept was 6.8. this data has a sample standard deviation of 0.9. (assume that the scores are normally distributed.) researchers conduct a one-mean hypothesis at the 5% significance level, to test if the mean amount of time parents with young children sleep per night is greater than the mean amount of time last year. the null and alternative hypotheses are h0: μ=6.4 and ha: μ> 6.4, which is a right-tailed test. the test statistic is determined to be t0=1.89 using the partial t-table below, determine the critical value(s). if there is only one critical value, leave the second answer box blank.