Anewspaper story in knight ridder newspapers described an experiment in an article with the headline “doctor dogs diagnose cancer by sniffing it out.” in the experiment researchers trained dogs to identify people with breast or lung cancer. the dogs were trained to lay down if they detected cancer in a breath sample. after the training, dogs sniffed different breath samples of people with and without cancer. impartial observers watched the dogs and decided when the dog identified a person as having cancer. researchers then revealed the condition of the person who gave the breath sample and determined if the dog had correctly identified the presence of cancer. the newspaper states, “the researchers blinded both the dog handlers and the experimental observers to the identity of the breath samples.”

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.