Big Babies: A public health organization reports that 21% of baby boys 6 - 8 months old in the United States weigh more than 20 pounds. A sample of 14 babies is studied. Part 1 of 2 (a) What is the mean number who weigh more than 20 pounds in a sample of 14 babies aged 6 - 8 months? Round the answer to two decimal places. The mean number who weigh more than 20 pounds is Part 2 of 2 X 3 (b) What is the standard deviation of the number who weigh more than 20 pounds in a sample of 14 babies aged 6 - 8 months? Round the answer to four decimal places. The standard deviation of the number who weigh more than 20 pounds is C 0

- How do you know if a sample is significant different from the population mean? In other words, whatstatistics will tell you if your results are statistically significant? -What does “statistically significant” mean?

One personality test available on the World Wide Web has a subsection designed to assess the "honesty" of the test-taker. After taking the test and seeing your score for this subsection, you're interested in the mean score,  μ , among the general population on this subsection. The website reports that  μ  is  148 , but you believe that  μ  is greater than  148 . You decide to do a statistical test. You choose a random sample of people and have them take the personality test. You find that their mean score on the subsection is  152  and that the standard deviation of their scores is  28 . Based on this information, answer the questions below. What are the null hypothesis ( H0 ) and the alternative hypothesis ( H1 ) that should be used for the test? H0 :  μ  is   H1 :  μ  is  In the context of this test, what is a Type I error?A Type I error is  the hypothesis that  μ  is   when, in fact,  μ  is  .Suppose that you decide not to…

claim that the mean IQ score of people With low blood lead levels is higher than the mean IQ score of people with high blood lead levels.