Abook store is hosting a special night in which families can enjoy a story and craft time. tickets to the event must be bought ahead of time and are $1.50 for children and $2.50 for adults. so far, 45 children's tickets have been sold, which is 60% of the total tickets sold. how many tickets have been sold so far? show or explain how you got your answer.

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.