The manager of a grocery store has taken a random sample of 196 customers.

The manager of a grocery store has taken a random sample of 100 customers. The average...

The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took the customers in the sample to check out was 3.1 minutes. The population standard deviation is known to be 0.5 minute. We want to test to determine whether or not the mean waiting time of all customers is significantly more than 3 minutes. The test statistic is _____. a. 1.64 b. 2.00 c. 1.96 d. .056

2. The manager of a grocery store has taken a random sample of 100 customers. The...

2. The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took the customers in the sample to check out was 3.1 minutes. The population mean is 3.5 minutes and the population standard deviation is known to be 0.5 minutes. We would like to know if there is evidence of a change in average check out time. Explain in the context of this question what a type 1 error would...

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.

The manager of a grocery store has taken a random sample of 100 customers. The average...

The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took the customers in the sample to check out was 4.9 minutes with a sample standard deviation of 0.5 minutes. Conduct a test to determine whether or not the mean waiting time of all customers is significantly more than 5 minutes. Use a significance level of α = 0.01.

The manager of a grocery store has taken a random sample of 100 customers. The average...

The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took the customers in the sample to check out was 3.1 minutes. The population standard deviation is known at 0.5 minutes. We want to test to determine whether or not the mean waiting time of all customers is significantly different than 3 minutes. Use α = 0.05. 14. The test statistic is a. 1.96 b. 1.64 c. 2.00 d. 0.056...

The manager of a grocery store has taken a random sample of 100 customers to determine...

The manager of a grocery store has taken a random sample of 100 customers to determine whether or not the mean waiting time of all customers is significantly more than 3 minutes. She observes that the average length of time it took the customers in the sample to check out was 3.1 minutes. The population standard deviation is known to be 0.5 minutes. USE INFORMATION TO ANSWER THE FOLLOWING: 1A. What is the appropriate test to use for this problem?...

You randomly sample 100 Publix customers. On average, it took these customers 3 minutes to check...

You randomly sample 100 Publix customers. On average, it took these customers 3 minutes to check out. It is known that the standard deviation of the checkout time is one minute. The sample mean will provide a margin of error of ____ if you use an alpha of .05. a .196 b 0.10 c 1.96 d 2.08

Suppose a grocery store is considering the purchase of a new self-checkout machine that will get...

Suppose a grocery store is considering the purchase of a new self-checkout machine that will get customers through the checkout line faster than their current machine. Before he spends the money on the equipment, he wants to know how much faster the customers will check out compared to the current machine. The store manager recorded the checkout times, in seconds, for a randomly selected sample of checkouts from each machine. The summary statistics are provided in the table. Group Description...

A customer plans to checkout at a grocery store but finds all 5 cashiers busy serving...

A customer plans to checkout at a grocery store but finds all 5 cashiers busy serving other customers. There are no other customers when this person arrives, and they will be served as soon as someone finishes. All customer arrival and service times are independent and exponentially distributed. a) What is the probability that this customer will not be the last customer to depart? b) If the average service time per cashier is 4 minutes, what is the average time...

A customer plans to checkout at a grocery store but finds all 5 cashiers busy serving...

A customer plans to checkout at a grocery store but finds all 5 cashiers busy serving other customers. There are no other customers when this person arrives, and they will be served as soon as someone finishes. All customer arrival and service times are independent and exponentially distributed. a) What is the probability that this customer will not be the last customer to depart? b) If the average service time per cashier is 4 minutes, what is the average time...