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 4 points with 99% confidence assuming s=10.7 based on earlier​ studies? Suppose the doctor would be content with 95% confidence. How does the decrease in confidence affect the sample size​ required?

Q: sample of 36 students to answer the question, “How anxious do you feel when you know you have to do…

A: Given that  Sample size (n) =36 Sample mean (x¯) = 58 Sample Standard deviation (s) = 30 Confidence…

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A: The 90% confidence interval is from –10 to –5. The 90% confidence interval for the mean of the…

Q: We have presented a confidence interval (CI) for the difference, μ1 − μ2, between two population…

A: It is given that the 99% confidence interval for the difference between two population  means is…

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 ,

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A:

Q: n Find the size of the sample needed to estimate the difference between the proportions of Democrats…

A:

Q: Hello. I appreciate any help. Thanks.

A: Standard Error of estimate:S=√MSEMean square error:The formula for the mean square error is,MSE =…

Q: What is the formula for t RATIO FOR TWO POPULATION MEANS (TWO INDEPENDENT SAMPLES)?

A: To compare population means of two independent samples t-test is used. The null hypothesis is: The…

Q: A psychologist is studying smokers' self-images, which she measures using the self-image (SI) score…

A: Since you have posted a question with multiple sub parts, according to our guidelines we can solve…

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: you want to obtain a sample to estimate a population mean. based on previous evidence, you believe…

A:

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: uct a survey on your college campus to learn about the political awareness of students. You want to…

A: The critical value from standard normal table at 95% confidence level will be:

Q: Life on other Planets Forty-two percent of people believe that there is life on other planets in the…

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Q: Target wants to know if their online sales are above what they observed last year during the…

A: Given that; A hypothesis is given and a decision is also made. By using hypothesis concept I solve…

Q: 3. This year college athletes around the nation began to be able to profit from their name, image,…

A: Hypothesis testing

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: In 2002 a national vital statistics report indicated that about 3.7% of all births produced twins.…

A: The value of p is 0.037, the value of x is 14 and the sample size n is 598.

Q: N=15 scores has ΣX=120.

A: Given, N=15 ∑X=120

Q: A psychologist wants to estimate the amount of math anxiety that the population of high school…

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Q: A population of N = 6 scores has ΣX = 42. What is the population mean?

A: Given ,Population of N=6 scoresand Σx =42

Q: A psychologist wants to estimate the amount of math anxiety that the population of high school…

A: The psychologist wants to estimate the amount of math anxiety that the population of high school…

Q: 1. In the packaging of M&Ms, inspectors collected a representative sample of 64 bags of M&Ms and…

A: It is given that the sample of 64 bags of M&Ms are collected by inspectors. The sample mean is…

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: In 1988, on the math SAT, the males taking the exam averaged about 500, while the females averaged…

A: From the provided information,

Q: Suppose you survey a random sample from a large population to understand the population proportion.…

A: Obtain the sample size of a no preliminary estimate for p. The formula of sample size is, Obtain…

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

A: From the provided information, The claim is that  the proportion of women over 40 who regularly have…

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Q: Suppose data shows that only 50% of breast cancer patients can survive more than 5 years. You…

A: The objective of this question is to identify the correct null and alternative hypotheses for a…

Q: A psychologist wants to estimate the amount of math anxiety that the population of high school…

A:

Q: In the population of senior students at Shermer High School, the proportion who plan to attend…

A: From the provided information, Population proportion (p) = 0.64 Sample size (n) = 100 Sample…