A local convenience store in a large city closes each day at 10 P.M. The owner of the store is investigating whether mean sales will increase by at least $10 per day if the store remains open until 11 P.M. The owner asked the 41 members of a local civic group to estimate the amount of money they might spend during the extra hour. The sample mean was $11.50. The owner will conduct a one-sample tt-test for a population mean. Have the conditions for inference been met?     Yes, all conditions have been met. A No, the sample was not chosen using a random method. B No, the sample size is greater than 10 percent of the population. C No, the sample size is not large enough to assume normality of the sampling distribution. D No, the distribution of the sample is not normal. E

The mean purchase total is $93.80 and the median purchase total is $75.80. The store manager investigates and learns that the customer that made a $500 purchase had not purchased groceries, but rather a $500 gift card. Because this customer's purchase was not typical, the manager decides to exclude this total from the data set. How will removing the $500 purchase from the data set affect the value of the mean and the median?

In a city with three high schools, all the ninth graders took a Standardized Test, with these results: High School Mean score on test Number of ninth graders Glenwood 77 259 Central City 90 344 Lincoln High 66 171 The city's PR manager, who never took statistics, claimed the mean score of all ninth graders in the city was 77.7 . Of course, that is incorrect. What is the mean score for all ninth graders in the city? USE EXCEL. Round your answer to one decimal place.

In a city with three high schools, all the ninth graders took a Standardized Test, with these results: Number of ninth graders High School Mean score on test Glenwood 77 264 Central City Lincoln High 91 303 70 170 The city's PR manager, who never took statistics, claimed the mean score of all ninth graders in the city was 79.3. Of course, that is incorrect. What is the mean score for all ninth graders in the city? Round to one decimal place. mean of all ninth grader's scores =

I am lookin for the relationship between the sample mean and the population mean and also the relationship between the standard error and the sample size.

Suppose you made 5 measures of your walking stride and got the following values: 0.81 m,  0.87 m, 0.79 m, 0.84 m, and 0.83 m What is the Standard Deviation (in meters) of this sample? You may either do this by hand or use your favorite math tool.

If you wanted to determine whether mean levels of blood glucose were different according to gender and age a one-way ANOVA would be an appropriate test to perform.  True  False

According to the U.S. Census, the average adult woman is the United States is 65 inches tall and the standard deviation is 3 inches.  If Zsike is 67 inches tall, what is her z-score?

A statisican that is a sports enthusiast estimated the mean cost for regular season upper level NBA tickets. They determined the mean cost to be between $52 and $78. What is the sample mean (7) ? A What is the margin of error (E)? AV

Name: ID: B 14. Is the sample mean, calculated from a random sample, an unbiased estimator of the population mean? Explain.