The length of human hair is proportional to the number of months it has grown.

a. What is the hair length in centimeters after 6 months? Round your answer to the nearest hundredth.

The hair length is about

centimeters.

Question 2

b. How long does it take hair to grow 8 inches?

It takes

months.

Question 3

c. Use a different method than the one in part (b) to find how long it takes hair to grow 20 inches.

It takes

months.

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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.