Question

From a previous report, the mean number of days for patients waiting for bypass surgery is...

From a previous report, the mean number of days for patients waiting for bypass surgery is 18.2 days with a standard deviation of approximately 10 days. The population distribution is skewed right (positively skewed).

a) If we drew a random sample of 22 patients waiting for bypass surgery, then would it be reasonable to say that the sampling distribution of a sample mean, , will be approximately normal? Answer either yes or no.

b) A random sample of 50 patients waiting for bypass surgery was selected. Calculate the mean and the standard deviation of the sampling distribution. Round the standard deviation to 4 decimal places.

c) What is the probability that the average time for these 50 patients waiting for bypass surgery is less than 22 days? Hint: Find .

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

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
According to a previous year's report, 18% of children have myopia (the condition of nearsightedness). A...
According to a previous year's report, 18% of children have myopia (the condition of nearsightedness). A random sample of 195 children recently had their vision checked. a) Based on the sample of 195 children, show that the Success/Failure condition is satisfied so that the sampling distribution of p̂ is approximately normal. Don't round the results. b) Based on the sample of 195 children, find the mean and standard deviation of the sampling distribution of p̂. Round the standard deviation to...
You are the manager of a restaurant for a​ fast-food franchise. Last​ month, the mean waiting...
You are the manager of a restaurant for a​ fast-food franchise. Last​ month, the mean waiting time at the​ drive-through window for branches in your geographical​ region, as measured from the time a customer places an order until the time the customer receives the​ order, was 3.9 minutes. You select a random sample of 64 orders. The sample mean waiting time is 3.67 ​minutes, with a sample standard deviation of 0.8 minute. Complete parts​ (a) and​ (b) below. a. At...
You are the manager of a restaurant for a​ fast-food franchise. Last​ month, the mean waiting...
You are the manager of a restaurant for a​ fast-food franchise. Last​ month, the mean waiting time at the​ drive-through window for branches in your geographical​ region, as measured from the time a customer places an order until the time the customer receives the​ order, was 3.9 minutes. You select a random sample of 81 orders. The sample mean waiting time is 4.12 minutes, with a sample standard deviation of 0.9 minute. Complete parts​ (a) and​ (b) below. A. At...
The days taken recovery in COVID patients is as following, a) In BC the mean is...
The days taken recovery in COVID patients is as following, a) In BC the mean is 14 days with in a sample of 40 patients and population standard deviation of 1.2. b) In Ontario, the mean is 16 days in a sample pf 42 patients and population std of 1. Test hypothesis that mean of these samples are significantly different using critical value approach and alpa = 0.05 show all steps. (hint z0.05/2 = 1.96)
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...
You are the manager of a restaurant for a? fast-food franchise. Last? month, the mean waiting...
You are the manager of a restaurant for a? fast-food franchise. Last? month, the mean waiting time at the? drive-through window for branches in your geographical? region, as measured from the time a customer places an order until the time the customer receives the? order, was 3.8 minutes. You select a random sample of 81 orders. The sample mean waiting time is 3.55 ?minutes, with a sample standard deviation of 0.9 minute. Complete parts? (a) and? (b) below. a. At...
The length of a women's pregnancies are normally distributed with a population mean of 266 days...
The length of a women's pregnancies are normally distributed with a population mean of 266 days and a population standard deviation of 16 days. a. What is the probability of a randomly selected pregnancy lasts less than 260 days? b. A random sample of 20 pregnancies were obtained. Describe the sampling distribution of the sample mean length of pregnancies (eg. Is it approximately normally distributed? Why or why not? What are the mean and standard deviation? c. What is the...
A study investigated ways to prevent staph infections in surgery patients. In a first step, the...
A study investigated ways to prevent staph infections in surgery patients. In a first step, the researchers examined the nasal secretions of a random sample of 6771 patients admitted to various hospitals for surgery. They found that 1251 of these patients tested positive for Staphylococcus aureus, a bacterium responsible for most staph infections. Let the mean of the sampling distribution be p=0.19. a) What does p stand for in this case (in words)? What is the sample in this case?...
A report announced that the median sales price of new houses sold one year was ?$211,000?,...
A report announced that the median sales price of new houses sold one year was ?$211,000?, and the mean sales price was ?$274,200. Assume that the standard deviation of the prices is ?$90,000. Complete parts? (a) through? (d) below. a) If you select samples of n=?2, describe the shape of the sampling distribution of X. Choose the correct answer below. A.The sampling distribution is skewed to the? right, but less skewed to the right than the population. B.The sampling distribution...
The distribution of the commute times for the employees at a large company has mean 22.4...
The distribution of the commute times for the employees at a large company has mean 22.4 minutes and standard deviation 6.8 minutes. A random sample of n employees will be selected and their commute times will be recorded. What is true about the sampling distribution of the sample mean as n increases from 2 to 10 ? The mean increases, and the variance increases. A The mean increases, and the variance decreases. B The mean does not change, and the...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT