Question

A current area of research interest is in the familial aggregation of cardiovascular risk factors. Suppose...

A current area of research interest is in the familial aggregation of cardiovascular risk factors. Suppose it is known that, overall, the average cholesterol level of children in the US is 175 mg/dl. Further assume that, as a researcher studying cardiovascular disease, you have access to a large number of hospital records of US mean who have died during the past year due to heart disease. You wish to conduct a test to determine if the mean cholesterol level of the children of these men is the same as children overall. You recall from the wonderful experience you had in your college biostatistics course that you can estimate the sample size required to conduct a test at a certain level and power. Suppose you wish to conduct a test at the 5% level to detect a difference between a true mean value and null hypothesis mean value of 15mg/dl with 90% power. Assume a population standard deviation of σ=50 .

Answer the following questions.

Briefly describe whether you would conduct a one-sided test or two-sided test and why?

According to your answer in part 6a, state the null and alternative hypotheses using notation established in class.

Is a sample of size 90 large enough to conduct the test with the desired level and power? Show your work in determining this answer to receive credit.

Homework Answers

Answer #1

This would be 2-tailed test

as she wish to conduct a test to determine if the mean cholesterol level of the children of these men is the same as children overall.

sigma = 50, alpah = 0.05, difference = 15 ,power = 90%

Using Minitab

stat -> power and sample size -> 1-sample z

n = 117

n = 90 is not large enough

any doubts please ask ! thank you:)

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A current area of research interest is in the familial aggregation of cardiovascular risk factors. Suppose...
A current area of research interest is in the familial aggregation of cardiovascular risk factors. Suppose it is known that, overall, the average cholesterol level of children in the US is 175 mg/dl. Further assume that, as a researcher studying cardiovascular disease, you have access to a large number of hospital records of US mean who have died during the past year due to heart disease. You wish to conduct a test to determine if the mean cholesterol level of...
A serum cholesterol level above 250 mg/dl of blood is a risk factor for cardiovascular disease...
A serum cholesterol level above 250 mg/dl of blood is a risk factor for cardiovascular disease in humans.  At a medical center in St. Louis, a study to test the effectiveness of new cholesterol-lowering drug was conducted.  One hundred people with cholesterol levels between 250 mg/dl and 300 mg/dl were available for this study.  Fifty people were assigned at random to each of two treatment groups.  One group received the standard cholesterol-lowering medication and the other group received the new drug.  After taking the drug...
For each of the following scenarios, identify: the population of interest, the outcome variable being measured...
For each of the following scenarios, identify: the population of interest, the outcome variable being measured on each observational unit, whether the outcome variable being measured is categorical or quantitative/Continuous, the parameter of interest, define both in words and using the appropriate statistical symbol (π, π1 -π2, µ, µ1 - µ2, or µd), and the null and alternative hypotheses, written in correct statistical notation (not in words) Name the hypothesis test you would use. For example, some tests we have...
5. A study was conducted to investigate the risk factors for peripheral arterial disease among persons...
5. A study was conducted to investigate the risk factors for peripheral arterial disease among persons 55-74 years of age. Data were collected pertaining to LDL cholesterol levels (mmol/liter) from four different subgroups of subjects: Group Sample Size Sample Mean (intermittent) Patients with intermittent claudication 25 6.28 (major) Major asymptomatic disease cases 35 5.70 (minor) Minor asymptomatic disease cases 27 5.04 (no) Those with no disease 30 5.16 It is assumed that LDL values are approximately normally distributed in each...
QUESTION 6 (1 + 2 + 1 + 2 + 2 + 2 = 10 marks)...
QUESTION 6 (1 + 2 + 1 + 2 + 2 + 2 = 10 marks) Please note that each part of this question is independent Leather shoes are examined by an inspector in a Melbourne factory and each pair is classified as either perfect or defects. A sample of 350 pairs is randomly taken. 200 pairs are produced by Machinist A and 150 pairs by Machinist B. 8 of the pairs produced by machinist A are found to be...
1. Find the area under the standard normal curve (round to four decimal places) a. To...
1. Find the area under the standard normal curve (round to four decimal places) a. To the left of  z=1.65 b. To the right of z = 0.54 c. Between z = -2.05 and z = 1.05 2. Find the z-score that has an area of 0.23 to its right. 3. The average height of a certain group of children is 49 inches with a standard deviation of 3 inches. If the heights are normally distributed, find the probability that a...
Multiple Choice Questions Q1. In a hypothesis test, Beta is best described by P (Type I...
Multiple Choice Questions Q1. In a hypothesis test, Beta is best described by P (Type I error) P (Test Stat>|Observed Stat|) Power P (Type II error) Q2. Which alternative hypothesis would I need to double the p-value in a test for the mean? No feasible answer Lower tailed alternative Two sided alternative Upper tailed alternative Suppose our p-value is .184. What will our conclusion be at alpha levels of .10, .05, and .01? We will reject Ho at alpha=.10 or...
Delta airlines case study Global strategy. Describe the current global strategy and provide evidence about how...
Delta airlines case study Global strategy. Describe the current global strategy and provide evidence about how the firms resources incompetencies support the given pressures regarding costs and local responsiveness. Describe entry modes have they usually used, and whether they are appropriate for the given strategy. Any key issues in their global strategy? casestudy: Atlanta, June 17, 2014. Sea of Delta employees and their families swarmed between food trucks, amusement park booths, and entertainment venues that were scattered throughout what would...
What tools could AA leaders have used to increase their awareness of internal and external issues?...
What tools could AA leaders have used to increase their awareness of internal and external issues? ???ALASKA AIRLINES: NAVIGATING CHANGE In the autumn of 2007, Alaska Airlines executives adjourned at the end of a long and stressful day in the midst of a multi-day strategic planning session. Most headed outside to relax, unwind and enjoy a bonfire on the shore of Semiahmoo Spit, outside the meeting venue in Blaine, a seaport town in northwest Washington state. Meanwhile, several members of...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT