Fast Food Drive-Thru Accuracy If two orders are selected, find the probability that they are both from Wendy’s.

Use the data in the following table, which lists drive-thru order accuracy at popular fast food chains (data from a QSR Drive-Thru Study). Assume that orders are randomly selected from those included in the table.

	McDonald's	Burger King	Wendy's	Taco Bell
Order Accurate	329	264	249	145
Order Not Accurate	33	54	31	13

Fast Food Drive-Thru Accuracy If two orders are selected, find the probability that they are both from Wendy’s.

Assume that the selections are made with replacement. Are the events independent?
If 2 orders are placed without replacement, what is the probability that all orders are from Wendy’s?
Assume that the selections are made without replacement. Are the events independent?
If one order is selected, find the probability of getting an order from McDonald’s or Wendy’s or an order that IS NOT accurate.

Solutions

Expert Solution

The 2 way table is:

Order Accurate	329	264	249	*145*	987
*Order Not Accurate*	33	54	31	13	131
	362	318	280	158	1118

Assume that the selections are made with replacement. Are the events independent?

318/1118 * 318/1118 = 0.0809

Yes, the events are independent

If 2 orders are placed without replacement, what is the probability that all orders are from Wendy’s?

318/1118 * 317/1117 = 0.0807

No, the events are not independent

Assume that the selections are made without replacement. Are the events independent?

No, the events are not independent

If one order is selected, find the probability of getting an order from McDonald’s or Wendy’s or an order that IS NOT accurate.

329/1118 + 264/1118 + 131/1118 = 0.6476

orchestra answered 2 years ago

Next > < Previous

Related Solutions

In a study of fast food accuracy on drive-thru orders, Burger King had 264 accurate orders...

In a study of fast food accuracy on drive-thru orders, Burger King had 264 accurate orders and 54 that were not accurate. a) Construct a 95% CI for the percentage of orders that are not accurate. b) A similar survey at Wendy's yielded a 95% CI of inaccurate orders of 6.2% < p < 15.9%. Comparing the two results, what do you find?

In a study of fast food accuracy on drive-thru orders, Burger King had 264 accurate orders...

In a study of fast food accuracy on drive-thru orders, Burger King had 264 accurate orders and 54 that were not accurate. a. Construct a 95% CI for the percentage of orders that are not accurate. b. A similar survey at McDonald's yield a 95% CI of inaccurate orders of 6.2%<P<15.9%. Comparing the two results, what do you find?

Accuracy of Fast Food Drive-Through Orders In a study of Burger King drive-through orders, it was...

Accuracy of Fast Food Drive-Through Orders In a study of Burger King drive-through orders, it was found that 264 orders were accurate and 54 were not accurate. For McDonald’s, 329 orders were found to be accurate while 33 orders were not accurate (based on data from QSR magazine). Use a 0.05 significance level to test the claim that Burger King and McDonald’s have the same accuracy rates.

In a study of the accuracy of fast food drive-through orders, Restaurant A had 341accurate orders...

In a study of the accuracy of fast food drive-through orders, Restaurant A had 341accurate orders and 57 that were not accurate. Construct a 90% confidence interval estimate of the percentage of orders that are not accurate. a. Construct a 90% confidence interval. Express the percentages in decimal form. ------------- <p<------------- (Round to three decimal places as needed.) b. Compare the results from part (a) to this 90% confidence interval for the percentage of orders that are not accurate at...

In a study of the accuracy of fast food drive-through orders, McDonald's had 33. orders that...

In a study of the accuracy of fast food drive-through orders, McDonald's had 33. orders that were not accurate among 362 orders observed (based on data from QSR magazine). Construct a 95% confidence interval for the proportion of orders that are not accurate. What would be the sample sizes needed to get a 95% confidence interval of plus or minus 3% given that the initial estimate of the population proportion is either 1%, 25%, 50%, 75% or 99% (calculate the...

In a study of the accuracy of fast food drive-through orders, one restaurant had 36 orders...

In a study of the accuracy of fast food drive-through orders, one restaurant had 36 orders that were not accurate among 302 orders observed. Use a 0.10 significance level to test the claim that the rate of inaccurate orders is equal to 10%. 1. Does the accuracy rate appear to be acceptable? 2. Identify the null and alternative hypotheses for this test. 3. What is the test statistic for this hypothesis test? 4. What is the P-Value for this hypothesis...

In a study of the accuracy of fast food drive-through orders, one restaurant had 39 orders...

In a study of the accuracy of fast food drive-through orders, one restaurant had 39 orders that were not accurate among 327 orders observed. Use a 0.10 significance level to test the claim that the rate of inaccurate orders is equal to 10%. Does the accuracy rate appear to be acceptable? Identify the null and alternative hypotheses for this test. Choose the correct answer below. Identify the test statistic for this hypothesis test. The test statistic for this hypothesis test...

In a study of the accuracy of fast food drive-through orders, one restaurant had 33 orders...

In a study of the accuracy of fast food drive-through orders, one restaurant had 33 orders that were not accurate among 384 orders observed. Use a 0.10 significance level to test the claim that the rate of inaccurate orders is equal to 10%. Does the accuracy rate appear to be acceptable? Identify the test statistic and the P value.

In a study of the accuracy of fast food drive-through orders, one restaurant had 39 orders...

In a study of the accuracy of fast food drive-through orders, one restaurant had 39 orders that were not accurate among 340 orders observed. Use a 0.05 significance level to test the claim that the rate of inaccurate orders is equal to 10%. Does the accuracy rate appear to be acceptable? Identify the null and alternative hypotheses for this test. Identify the test statistic for this hypothesis test. Identify the P-value for this hypothesis test. Identify the conclusion for this...

study of the accuracy of fast food drive through orders, Restaurant A had 339 accurate orders...

study of the accuracy of fast food drive through orders, Restaurant A had 339 accurate orders and 57 that were not accurate. construct a 90% confidence interval estimate of the percentage of orders not accurate. compare the results from part (a) to the 90% confidence interval for the percentage of orders that are not accurate at Restaurant B: 0.134<p<0.184. what do you conclude?

Subjects