A store wants to determine the mean amount spent by a customer making a purchase.  They take a random sample of 150 sales and find that the 90% confidence interval is ($54.21, $66,10).  Which of the following best represents the meaning of this confidence interval? 

In a certain class the final grade is determined by two midterm exams, each of which counts for 25% of the grade, a class project which counts for 15% of the grade, homework which counts for 10% of the grade, attendance which counts for 5% of the grade and a final exam which counts for 20% of the grade.  If you have the following scores at the end of the semester, what is your final average? Data Table Grade Category Student Grade Midterm 1 86 Midterm 2 72 Project 93 Homework 82 Attendance 100 Final exam  85

A random sample of 250 residents of a Culver City indicate that 82 are satisfied with the services provided by the city.  A random sample of 325 residents of Santa Monica indicate that 129 are satisfied with the services provided by the city.  Assume that the conditions are met to calculate the 95% confidence interval for the difference in the proportions of Culver City and Santa Monica residents that are satisfied with the services provided by the city.   1. Are these considered dependent or independent populations?  [dep] 2. What is the point estimate of the difference in the proportions of Culver City residents and Santa Monica residents that are satisfied with services provided by the city?  [point] 3. We are 95% confident that the difference in the proportion of Culver City residents and Santa Monica residents who are satisfied with the services provided by their city is between [lower] and [upper] 4. Because the interval [is] we [conclude].   

What is the best description of the shape of the data set represented by this boxplot?

Provide an appropriate response.Over the last 10 years four mutual funds all had the same mean rate of return, 12%. These mutual funds had different standard deviations as follows: Mutual Money 8%, Co-joined Investments 6%, Together Fund 4%, All for One Fund 9%. Which mutual fund investment is the most consistent in rate of return?

Suppose we were interested in determining if there were differences in the average prices among twolocal supermarkets. We randomly pick the same six items to compare at both supermarkets. Which statisticalprocedure would be best to use for this study?

It is estimated that 82% of college students check their social media accounts at least once per day.  You believe that the proportion could be higher.  A random sample of 1072 college students indicates that 83.4% of the sample says that they check their social media accounts at least once per day.   Find the 95% confidence interval estimate of the proportion of college students that check their social media accounts at least once per day and explain whether, based on the interval, is the actual percentage being greater than 82% is supported by the interval.  1. The 95% confidence interval is from [lower] to [higher]. 2. The interval [supports] the actual percentage being greater than 82% because [why].

A variable that interferes with other variables in a study is called

The level of significance in a hypothesis test, 

The contingency table (also called the table of observed values) below shows the results of a random sample of registered voters that was conducted to see whether their opinions on a proposed law are related to their party affiliation. Use α = 0.05 to test if party opinion and approval of the law are independent.  Use the words and methods from the class.  Approve Disapprove No opinion Republican 35 55 42 Democrat 62 47 46 Other 15 17 20 Complete the following for the hypothesis test.  What are the null and alternative hypothesis? Ho: Party opinion and Approval of the Law are [ind] H1: Party opinion and Approval of the Law are [ind2] Find the test-statistic and p-value: Test Statistic = [TS]   (Rounded to 2 decimal places)         p-value = [pval]  (Rounded to 4 decimal places) What is the initial conclusion?  [initial]   Why?  [why] There is [suff] to conclude that party opinion and approval of the law are dependent. What is the value of the cell for Republican/Disapprove in the table of expected values?  [exp]