Deborah ran a 12-kilometer race. She completed the race in 1.6 hours. Deborah
speed for the first kilometer can be
represented by the function d 7.3h,
where d is distance in kilometers and his
time in hours. Was Deborah's average speed
for the first kilometer of the race faster or
slower than his average speed for the entire
race? Justify 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.