The table below gives the prices for Magic Carpet carpet cleaning
Size of house
Steam clean
Steam clean +
protective finish
$65
One-story
$40
Two-story
$60
$85
5. Huang has also had the carpet in his personal residence (two
stories) steam cleaned 5 times without the protective finish.
He received a special offer for being a loyal customer, so the
5th cleaning was at a 20% discount. How much did Huang
pay, on average, for 5 steam cleanings?
A. $81.60
B. $72.00
C. $62.40
D. $61.60
E. $57.60
W

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.