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 3points with 99% confidence assuming s = 14.7 based on earlier studies? Suppose the doctor would be content with 95% confidence. How does the decrease inconfidence affect the sample size required?Click the icon to view a partial table of critical values.subjects. (Round up to the nearest subject.)subjects. (Round up to the nearest subject.)A 99% confidence level requiresA 95% confidence level requiresHow does the decrease in confidence affect the sample size required?O A. Decreasing the confidence level increases the sample size needed.B. The sample size is the same for all levels of confidence.OC. Decreasing the confidence level decreases the sample size needed....

Answered: A doctor wants to estimate the mean HDL…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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An asset has 0.5% chance of attack and 20% chance of the attack being successful if it happens. The asset is valued at 25 on a hundred-point scale. If an attack happens and is successful, then the asset loses 75% of its value. It is further given that the give data is 90% accurate. Calculate the risk. give clear handwritten answer!
You intend to estimate a population mean with a confidence interval. You believe the population to have a normal distribution. Your sample size is 8. While it is an uncommon confidence level, find the critical value that corresponds to a confidence level of 93.5%.
Approximately 58% of all people are able to wink with both eyes. Is this percent different for people who wear glasses? A researcher tests 319 people who wear glasses and found that 204 could wink with both eyes. What can be concluded at the αα = 0.05 level of significance? For this study, we should use Select an answer z-test for the difference between two population proportions t-test for a population mean z-test for a population proportion t-test for the difference between two dependent population means t-test for the difference between two independent population means The null and alternative hypotheses would be: H0:H0: Select an answer μd p1 p μ1 μ Select an answer ≥ = ≠ ≤ H1:H1: Select an answer μ μ1 p p1 μd Select an answer < ≠ > = The test statistic ? z t = (round to 3 decimal places) The p-value = (round to 4 decimal places) The p-value is ? > ≤ αα. Based on this, we should Select an answer accept reject fail to reject the null hypothesis. Explain…
People were polled on how many books they read the previous year. Initial survey results indicate that s = 19.9 books. Complete parts (a) through (d) below. Click the icon to view a partial table of critical values. (a) How many subjects are needed to estimate the mean number of books read the previous year within six books with 90% confidence? This 90% confidence level requires subjects. (Round up to the nearest subject.) Partial Critical Value Table (b) How many subjects are needed to estimate the mean number of books read the previous year within three books with 90% confidence? This 90% confidence level requires subjects. (Round up to the nearest subject.) (c) What effect does doubling the required accuracy have on the sample size? Level of Confidence, Critical Value, Za/2 (1- a) • 100% Area in Each Tail, 2 A. Doubling the required accuracy nearly quadruples the sample size. 90% 0.05 1.645 B. Doubling the required accuracy nearly doubles the sample size. 95% 0.025 1.96 99% 0.005…
What sample size is needed to give a margin of error within +3% in estimating a population proportion with 90% confidence? An initial small sample has p = 0.77. %3D Round your answer up to the nearest integer. Sample size =
People were polled on how many books they read the previous year. Initial survey results indicate that s = 14.3 books. Complete parts (a) through (d) below. Click the icon to view a partial table of critical values. (a) How many subjects are needed to estimate the mean number of books read the previous year within four books with 90% confidence? This 90% confidence level requires 35 subjects. (Round up to the nearest subject.) (b) How many subjects are needed to estimate the mean number of books read the previous year within two books with 90% confidence? This 90% confidence level requires subjects. (Round up to the nearest subject.)
Fill in the missing entries in the ANOVA table.e) What proportion of the total variability of the stopping distance isexplained by the regression model?
You intend to estimate a population mean with a confidence interval. You believe the population to have a normal distribution. Your sample size is 8.Find the critical value that corresponds to a confidence level of 99%.
People were polled on how many books they read the previous year. Initial survey results indicate that s = 14.6 books. Complete parts (a) through (d) below. Click the icon to view a partial table of critical values. C (a) How many subjects are needed to estimate the mean number of books read the previous year within four books with 95% confidence? This 95% confidence level requires subjects. (Round up to the nearest subject.) (b) How many subjects are needed to estimate the mean number of books read the previous year within two books with 95% confidence? This 95% confidence level requires subjects. (Round up to the nearest subject.) (c) What effect does doubling the required accuracy have on the sample size? O A. Doubling the required accuracy nearly halves the sample size. O B. Doubling the required accuracy nearly doubles the sample size. O C. Doubling the required accuracy nearly quadruples the sample size. O D. Doubling the required accuracy nearly quarters the sample size. (d) How…
You want to obtain a sample to estimate a population mean. based on previous evidence, you believe the population standard deviation is approximately 23.6 you would like to be 90% confidence that your estimate is within 1.8 of the true population mean. How large of a sample size is required
People were polled on how many books they read the previous year. Initial survey results indicate that s = 11.9 books. Complete parts (a) through (d) below. A Click the icon to view a partial table of critical values. (a) How many subjects are needed to estimate the mean number of books read the previous year within six books with 95% confidence? This 95% confidence level requires subjects. (Round up to the nearest subject.) (b) How many subjects are needed to estimate the mean number of books read the previous year within three books with 95% confidence? This 95% confidence level requires subjects. (Round up to the nearest subject.) (c) What effect does doubling the required accuracy have on the sample size? O A. Doubling the required accuracy nearly halves the sample size. O B. Doubling the required accuracy nearly doubles the sample size. O C. Doubling the required accuracy nearly quarters the sample size. O D. Doubling the required accuracy nearly quadruples the sample size. (d)…
You run a normal serum glucose control and obtain a value of 4 mg/dL. The mean for this control is 74.8 mg/dL and 1 SD has been calculated as 1.2. Is the value of 78.4 within 2SD (95% confidence interval)? Circle the correct answer. YES NO

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