Consumer Reports uses a 100-point customer satisfaction score to rate the nation's major chain stores. Assume that from past experience with the satisfac population standard deviation of a = 12 is expected. Costco with its 432 warehouses in 40 states was the only chain store to earn an outstanding rating fo 15 Costco customer satisfaction scores is contained in the Excel Online file below. Construct a spreadsheet to answer the following questions. Open spreadsheet a. What is the sample mean customer satisfaction score for Costco (to 2 decimals)? b. What is the sample variance (to 2 decimals)? c. What is the sample standard deviation (to 2 decimals)? d. Construct a hypothesis test to determine whether the population standard deviation of 12 should be rejected for Costco. State the null and alternative hypotheses. Hoo² = 144 H₂:0² Ⓒ144 Calculate the value of the test statistic (to 2 decimals). p-value is With F

The following set of data represents the number of orders filled by a national-chain restaurant during a two week period. Construct a five number summary for the the data.   66, 75, 68, 89, 86, 73, 67, 75, 75, 82, 85, 74, 67, 61 (Round to the nearest hundredth, if needed).    Min _________________ Lower Quartile _________________ Median __________________ Upper Quartile _________________ Maximum __________________   What is the range and the interquartile range (IQR)?  Range __________________ Interquartile Range (IQR)  ___________________

Consider the following data: 2, 9, 5, 11, 7, 3. a. Calculate its mean and variance.  b. If all the above data was multiplied by 4, what would the new mean and variancebe?

The following refer to the following data set: 20 28 44 92 64 48 68 43 86 43 What is the mean (7) of this data set? mean = (Please show your answer to one decimal place.) What is the median of this data set? median = %3D What is the mode of this data set? mode = %3D