Walmart is an American multinational retail corporation that operates a chain of large department stores. In...
Walmart is an American multinational retail corporation that
operates a chain of large
department stores. In 2017, they conducted a study on the
amounts customers spent at their
stores in Shenzhen (SZ) on the day of New Year’s Eve. It was
found that the amounts were
normally distributed, with an average of ¥1,800 and a standard
deviation of ¥240.
Question 1:
Consider sampling with sample size 25 on the above population.
Compute the mean of the
sampling distribution of the...
In a study of monthly salary distribution of residents in Paris conducted in year 2015, it was found that the salaries had an average of €2200 (EURO) and a standard deviation of €550. Assume that the salaries were normally distributed. Question 1: Consider sampling with sample size 64 on the above population. Compute the mean of the ̅ sampling distribution of the mean (?). Question 2: Compute the standard deviation of the sampling distribution of the mean in Question 1...
In a consumer research study, several Meijer and Walmart stores were surveyed at random and the average basket price was recorded for each. You wish to determine if the average basket price for Meijer is different from the average basket price for Walmart. It was found that the average basket price for 25 randomly chosen Meijer stores (group 1) was $60.345 with a standard deviation of $10.8968. Similarly, a random sample of 20 Walmart stores (group 2) had an average...
In a consumer research study, several Meijer and Walmart stores were surveyed at random and the average basket price was recorded for each. It was found that the average basket price for 9 Meijer stores was $132.43 with a standard deviation of $27.802. 12 Walmart stores had an average basket price of $152.44 with a standard deviation of $17.921. Construct a 99% confidence interval for the difference between the true average basket prices (Meijer - Walmart). You can assume that...
Question 3 (1 point) In a consumer research study, several Meijer and Walmart stores were surveyed at random and the average basket price was recorded for each. You wish to determine if the average basket price for Meijer is different from the average basket price for Walmart. It was found that the average basket price for 25 randomly chosen Meijer stores (group 1) was $58.98 with a standard deviation of $12.8242. Similarly, a random sample of 20 Walmart stores (group...
Case 1 The amount of money spent by Safeway customers is normally distributed with mean 140 and a standard deviation of 12. Suppose that a sample of 64 customers are selected. Answer the following questions. What is the mean of the sampling distribution? 140 150 170 240 What is the standard error of the sampling distribution? 1.23 1.50 1.55 1.20 What is the probability that the average spending by the customers is greater than 144? 0.9962 0.9966 0.0038 0.0048 What...
The NJ Department of Transportation conducted a study to find the average amount of time car drivers spend commuting during weekends. They surveyed 196 car drivers and the study found out that the driver’s population spent an average of 13 hours commuting with a standard deviation of 11 hours. (a) What is the standard error of the mean? (b) Compute the probability the sample mean is greater than 15 hours? (c) Compute the probability the sample mean is less than...
In a study conducted by biologists Sokal and Hunter, the wing lengths of houseflies were found to be approximately normally distributed, with a mean wing length of 45.5 mm, and a standard deviation of 3.92 mm. A housefly is randomly selected, find the probability that its wing length is less than 45 mm.
The Customer Service Center in a large New York department store has determined that the amount of time spent with a customer about a complaint is normally distributed, with a mean of 8.7 minutes and a standard deviation of 2.0 minutes. What is the probability that for a randomly chosen customer with a complaint, the amount of time spent resolving the complaint will be as follows. (Round your answers to four decimal places.) (a) less than 10 minutes (b) longer...
The Customer Service Center in a large New York department store has determined that the amount of time spent with a customer about a complaint is normally distributed, with a mean of 9.1 minutes and a standard deviation of 2.8 minutes. What is the probability that for a randomly chosen customer with a complaint, the amount of time spent resolving the complaint will be as follows. (Round your answers to four decimal places.) (a) less than 10 minutes (b) longer...