A child psychologist is studying the effects sleep and behavior in preschool children. Research indicates that preschool age children require more than eight hours of sleep per night. sleeping concerned professor wants to find out if his college students sleep less than 8 hour a day. The child psychologist collected the following data from a group of fifteen preschool children and found the average number of hours sleep per day was 9.67 with a standard deviation of 1.91 hours per day. At the 1% significance level, do the data provide sufficient evidence that children in preschool get more than eight hours sleep per night. Perform a critical value test. Hypotheses: Ho: Ha: L hours hours Test statistic: Round to the nearest thousandth: Critical value(s); Ha Test statistic: hours Round to the nearest thousandth: Critical value(s): Round to the nearest thousandth: t= Decision: Interpretation: the null hypothesis. Previous Next