Suppose the age that children learn to walk is normally distributed with mean 11 months and standard deviation 2.3 month. 34 randomly selected people were asked what age they learned to walk. Round all answers to 4 decimal places where possible. For the 34 people, find the probability that the average age that they learned to walk is between 10.5 and 11.4 months old Find the Q1 and Q3 for the average first time walking age for groups of 34 people. Q1 =   Q3 =

Find the standard deviation of the following numbers (Round your answer to 4 decimal places.):  1, 4, 4, 7, 7, 7, 11, 11, 14, 16, 16

The average American gets a haircut every 34 days. Is the average smaller for college students? The data below shows the results of a survey of 15 college students asking them how many days elapse between haircuts. Assume that the distribution of the population is normal. 35, 23, 32, 38, 31, 39, 35, 25, 30, 36, 40, 27, 23, 32, 25 What can be concluded at the the a = 0.10 level of significance level of significance? a. For this study, we should use Select an answer b. The null and alternative hypotheses would be: Ho: ?v Select an answerv Hi: ?vSelect an answerv c. The test statistic ?v = (please show your answer to 3 decimal places.) d. The p-value = (Please show your answer to 3 decimal places.) e. The p-value is 2v a f. Based on this, we should Select an answerv the null hypothesis. g. Thus, the final conclusion is that.. O The data suggest the population mean is not significantly lower than 34 at a = 0.10, so there M 24 3. 4. 5 6. 7 EU

For a certain group of individuals, the average heart rate is 74 beats per minute. Assume the variable is normally distributed and the standard deviation is 4 beats per minute. If a subject is selected at random, find the probability that the person has the following heart rate. Use a graphing calculator. Round the answers to four decimal places. Less than 78 beats per minute =