Answer Happy

Question 15 1 pts Joan has noticed that the probability distribution for X = number of students in line at the convenience store is as follows. What is the expected value of X, E(X)? Give your answer rounded to 1 decimal place. Ik 0 1 2 3 4 P(X = k) 0.10 0.10 = 0.40 0.30 0.10

D Question 22 1 pts a The Better Business Bureau of San Diego states that the standard hotel room average price for a Saturday night stay is $165, but you think it is higher. You go out and take a random sample of 33 hotels and get an average price of $181 with a sample standard deviation of $25. The test statistic is _-. Round your answer to three decimal places.

D Question 23 1 pts A mining company wants to test a claim concerning the mean weight of their silver nuggets. They are testing the null hypothesis that the true mean is 3 ounces, against the alternative that the mean is less than 3 ounces. The p-value for the hypothesis test was determined to be 0.023. Which of the following is a correct interpretation of this p-value? Check all that apply. The results of the test are statistically significant at the .05 level, but not at the .01 level. The null hypothesis would be rejected at both the 0.05 and 0.01 levels. The null hypothesis would be rejected at a 0.01 level, but not at a 0.05 level. The probability is .023 that the mean is 3 oz.

Question 32 1 pts Nine hundred (900) high school freshmen were randomly selected for a national survey. Among survey participants, the mean grade-point average (GPA) was 2.7, and the standard deviation was 0.4. What is the value of the standard error that we would plug into the formula for a confidence interval for the mean а GPA? Round your answer to three decimal places.