A doctor wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. How many subjects are needed to estimate the mean HDL cholesterol within 2 points with 99% confidence assuming s = 18.5 based on earlier studies? Suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size required? Click the icon to view a partial table of critical values. A 99% confidence level requires subjects. (Round up to the nearest subject.)

Q: 3. A clinical psychologist is keen about finding out if the length of therapy will significantly…

A: “Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Q: People were polled on how many books they read the previous year. Initial survey results indicate…

A: From the provided information, Sample standard deviation (s) = 13.5 Confidence level = 90% Margin of…

Q: earchers wanted to know whether body mass index d conducted a study a study among 1,360 women ents…

A: A relative risk collates the risk of disease, injury, or death among one group with risk among other…

Q: AT scores are distributed with a mean of 1,500 and a standard devieation of 287. You are interested…

A: Given that, Critical value: Using the z-table, the critical value at 85% confidence level is ,

Q: What size sample should be used to estimate a population proportion within 0.02 with 80% confidence…

A: population proportion = P = 0.02 Level of significance = α = 0.02 population proportion is between…

Q: A doctor wants to estimate the mean HDL cholesterol of all​ 20- to​ 29-year-old females. How many…

A: Find z-critical value:…

Q: People were polled on how many books they read the previous year. Initial survey results indicate…

A: The formula of the sample size is,where, denotes the critical value of Z denotes the population…

Q: A doctor wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. How many…

A: Given that,  Margin of error=4 significance level=0.01 s=13.2 Z c=2.326 The sample size can be…

Q: The Congressional Budget Office reports that 36% of federal civilian employees have a bachelor's…

A: Note:Thank you for posting the question! Since your question has more than 3 parts, we have solved…

Q: SAT scores are distributed with a mean of 1,500 and a standard deviation of 300. You are interested…

A: Critical value: The value of α is 0.05 for 95% confidence level. Using excel formula…

Q: SAT scores are distributed with a mean of 1,500 and a standard deviation of 300. You are interested…

A:

Q: Assume the World Health Organization believes that physician access has an effect on life…

A: 1. The regression R-squared is given as 0.4741.

Q: A doctor wants to estimate the mean HDL cholesterol of all 20-to 29-year-old females How many…

A: The margin of error is 4 points, and the confidence level is 0.99.The standard deviation is 13.3.

Q: students. You want to estimate the proportion p of students who never floss with 90% confidence and…

A: It is given that Proportion p = 0.27 Margin of error E = 0.03 Level of confidence = 90% The critical…

Q: This was a question on my homework and I would like to know if I answered it correctly. Thank you…

A: Odds (O):The “odds” of the occurrence of an event is the ratio of the number of occurrences of the…

Q: In a poll, 1200 adults in a region were asked about their online vs. in-store clothes shopping. One…

A: Answer:- Given, Sample size, n = 1200  Sample proportion, p = 38% = 0.38  Confidence level = 95% =…

Q: Which of the following probabilities indicates a relationship that is not statisti­cally…

A: By statistically insignificant, we means that there is less difference between the measure of null…

Q: People were polled on how many books they read the previous year. Initial survey results indicate…

A: Given,Standard deviation(S) = 13.9Margin of error  E) = 6x=1-0.90x=0.1x2=0.0570.05=1.645

Q: You are conducting a study to see if the proportion of women over 40 who regularly have mammograms…

A: Given z= -2.806  where z is standard normal variable. Formulae used: P value= P(Z<z)

Q: Find a 95% confidence interval for the difference between full attendance students' Exam 5 score and…

A: We have given data,  Less attendance Full attendance 90 96 90 96 60 100 50 99 69   88…

Q: Construct a 90% confidence interval estimate of the proportion of Lipitor users who will report…

A: The drug Lipitor is meant to lower cholesterol levels. In a clinical trial of 800 patients, 5%…

Q: You measure 30 backpacks' weights, and find they have a mean weight of 78 ounces. Assume the…

A:

Q: You are testing the difference between a sample mean and a population mean in a one-tailed test that…

A:

Q: Scores of an IQ test have a​ bell-shaped distribution with a mean of 100 and a standard deviation of…

A: Given, Scores of an IQ test have a​ bell-shaped distribution with a mean of 100  and a standard…

Q: The p-value to test if Education is a significant predictor (previous question) is approximately 0…

A: From the given information, the p-value to test if Education is a significant predicator is about 0.

Q: A doctor wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. How many…

A: Given information Standard deviation s = 16.4 Confidence interval = 0.95 Significance level(α) = 1-…

Q: People were polled on how many books they read the previous year. Initial survey results indicate…

A: From the provided information,Confidence level = 90%

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.