Question

The population mean waiting time to check out of a supermarket has historically been 4 minutes....

The population mean waiting time to check out of a supermarket has historically been 4 minutes. In an effort to reduce the waiting time, you, as store manager, conducted an experiment with infrared cameras that use body heat and in-store software to determine how many lanes should be opened. To test the effectiveness of this process, you selected a random sample of 100 customers and recorded their waiting time. For this sample, the mean waiting time to check out was 3.3 minutes, with a sample standard deviation of 2.0 minutes.

At the 0.05 level of significance, is there evidence that the population mean waiting time to check out is less than 4 minutes?

  1. State your null and alternative hypothesis
  2. What is your conclusion based on this test? Interpret the meaning of the p-value in this case.
  3. Based on these results, what is your decision as store manager.
Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

hii..if you have any doubt please ask by comment.. thanks..

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
The population mean waiting time to check out of a supermarket has historically been 4 minutes....
The population mean waiting time to check out of a supermarket has historically been 4 minutes. In an effort to reduce the waiting time, you, as store manager, conducted an experiment with infrared cameras that use body heat and in-store software to determine how many lanes should be opened. To test the effectiveness of this process, you selected a random sample of 100 customers and recorded their waiting time. For this sample, the mean waiting time to check out was...
A] this problem requires PhStat solution. A marketing researcher wants to estimate the mean amount spent...
A] this problem requires PhStat solution. A marketing researcher wants to estimate the mean amount spent ($) on Amazon.com by Amazon Prime member shoppers. Suppose a random sample of 100 Amazon Prime member shoppers who recently made a purchase on Amazon.com yielded a mean amount spent of $1,500 and a standard deviation of $200. 1. Using a 0.05 level of significance, state your decision. 2. Using the critical value approach, is there evidence that the population mean amount spent on...
CCN and ActMedia provided a television channel targeted to individuals waiting in supermarket checkout lines. The...
CCN and ActMedia provided a television channel targeted to individuals waiting in supermarket checkout lines. The channel showed news, short features, and advertisements. The length of the program was based on the assumption that the population mean time a shopper stands in a supermarket checkout line is 8 minutes. A sample of actual waiting times will be used to test this assumption and determine whether actual mean waiting time differs from this standard. A sample of 100 shoppers showed a...
CCN and ActMedia provided a television channel targeted to individuals waiting in supermarket checkout lines. The...
CCN and ActMedia provided a television channel targeted to individuals waiting in supermarket checkout lines. The channel showed news, short features, and advertisements. The length of the program was based on the assumption that the population mean time a shopper stands in a supermarket checkout line is 7.7 minutes. A sample of actual waiting times will be used to test this assumption and determine whether actual mean waiting time differs from this standard. a. Formulate the hypotheses for this application....
Waiting time for checkout line at two stores of a supermarket chain were measured for a...
Waiting time for checkout line at two stores of a supermarket chain were measured for a random sample of customers at each store. The chain wants to use this data to test the research (alternative) hypothesis that the mean waiting time for checkout at Store 1 is lower than that of Store 2. (12 points) Store 1 (in Seconds) Store 2 (in Seconds) 470 375 394 319 167 266 293 324 187 244 115 178 195 279 400 289 228...
The manager of a health maintenance organization has set a target the mean waiting time of...
The manager of a health maintenance organization has set a target the mean waiting time of nonemergency patients to not exceed 30 minutes. In spot checks, manager finds the waiting times for 22 patients; the patients are selected randomly on different days. Assume that the population standard deviation of waiting times is 10 minutes. Suppose that sample mean waiting time is 38.1 minutes and test the claim at 4% SL. Complete hypothesis testing has to be shown, including the interpretation...
Management is exploring adding more cashiers at the check-out counter of a supermarket to reduce the...
Management is exploring adding more cashiers at the check-out counter of a supermarket to reduce the waiting time of customers. Based on the available information the waiting times have a standard deviation of approximately 5.6 min. If management wants to estimate the waiting time to within 2 min. with 90% confidence, how large a sample must be chosen? Can you write them with excel formulas? Show your work step by step.
According to a previous study, check out times at a supermarket are between 2 to 7...
According to a previous study, check out times at a supermarket are between 2 to 7 minutes (120 to 8400 seconds.) A survey involving a random sample of customers of the supermarket is planned and the first order of business is to decide on an appropriate sample size. The 95% level of confidence will be used. (4 points) What is the planning value for the population standard deviation to be used in the sample size formula for estimating the population...
The manager of a grocery store has taken a random sample of 4 customers. The average...
The manager of a grocery store has taken a random sample of 4 customers. The average length of time it took the customers in the sample to check out was 6 minutes. The population standard deviation is known to be 0.1 minutes. We want to test to determine whether or not the mean waiting time of all customers is significantly more than 7 minutes. Use a significance level of (alpha = 0.01). Please show work.
A national grocer’s magazine reports the typical shopper spends 8 minutes in line waiting to check...
A national grocer’s magazine reports the typical shopper spends 8 minutes in line waiting to check out. A sample of 18 shoppers at the local Farmer Jack’s showed a mean of 7.1 minutes with a standard deviation of 2.7 minutes. Is the waiting time at the local Farmer Jack’s less than that reported in the national magazine? Use the 0.100 significance level. What is the decision rule? (Negative amount should be indicated by a minus sign. Round your answer to...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT