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 = 15.8 based on earlier studies? Suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size required? E Click the icon to view a partial table of critical values. A 99% confidence level requires subjects. (Round up to the nearest subject.) Partial Critical Value Table A 90% confidence level requires subjects. (Round up to the nearest subject.) How does the decrease in confidence affect the sample size required? Level of Confidence, Critical Value, z/2 (1-a) • 100% Area in Each Tail, 2 90% 95% 99% 0.05 0.025 0.005 1.645 1.96 2.575 O A. Decreasing the confidence level increases the sample size needed. O B. The sample size is the same for all levels of confidence. Oc. Decreasing the confidence level decreases the sample size needed. Print Done

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 = 15.8 based on earlier studies? Suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size required? E Click the icon to view a partial table of critical values. A 99% confidence level requires subjects. (Round up to the nearest subject.) Partial Critical Value Table A 90% confidence level requires subjects. (Round up to the nearest subject.) How does the decrease in confidence affect the sample size required? Level of Confidence, Critical Value, z/2 (1-a) • 100% Area in Each Tail, 2 90% 95% 99% 0.05 0.025 0.005 1.645 1.96 2.575 O A. Decreasing the confidence level increases the sample size needed. O B. The sample size is the same for all levels of confidence. Oc. Decreasing the confidence level decreases the sample size needed. Print Done

Name: A doctor wants to estimate the mean HDL cholesterol of all 20- to 29-
Uploaded: 2024-03-20T07:06:16.000Z
Channel: Bartleby
Description: 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 = 15.8 based onearlier studies? Suppose the docto

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Related questions

Q: One year, the mean age of an inmate on death row was 40.5 years. A sociologist wondered whether the…

Q: One year, the mean age of an inmate on death row was 38.8 years. A sociologist wondered whether the…

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

Q: samples of 500 persons each, and using the 0.01 level of significance, can we conclude that the…

A: It is given that For conventional PC, sample size n1 = 500, sample proportion = 0.80 For touchscreen…

Q: A person is interested in studying the amount of time (in minutes) people spend on social media in…

A: Given, A person is interested in studying the amount of time (in minutes) people spend on social…

Q: A researcher is interested in the impact of joining a weight loss program in the past 12 months on…

Q: Find the margin of error if the sample proportion is 0.37 and the sample size is 300. on Consider…

A: Margin of error is the error due to random sampling. The margin of error decreases with increase in…

Q: What percentage of infants who test positive using the test will actually have Down’s syndrome?

A: Let us define some events A : an infant has Down's syndrome. B : an infant does not have Down's…

Q: The statistics below describe the data collected by a business person who researched the amount of…

A: Given that,

Q: Twenty years ago, 47% of parents of children in high school felt it was a serious problem that…

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

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: Given sensitivity is 0.88, specificity is 0.95, and prevalence is 0.07, find the positive predictive…

A: It is required to find the positive predictive value, and negative predictive value, using…

Q: A hospital administrator wants to estimate the proportion of patients whose hospital stay exceeds a…

A: Given Margin of error=0.06 P-cap=0.5

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

A: Given information- Margin of error, E = 6% = 0.06 Confidence level, c = 98% Since nothing is known…

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

A: The sample size is defined as the number of observations used for determining the estimations of a…

Q: A recent Gallup poll asked Americans to disclose the number of books they read during the previous…

Q: A researcher wants to examine how a new intervention helps children learn to read. A random sample…

A: In the provided information, the one sample t-test will be used for measurement because it is used…

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 table summarizes the success and failures when subjects used different methods (yoga, acupuncture,…

A: H0 : success is independent of the method used H1 : success is dependent on the method used

Concept explainers

Inverse Normal Distribution

The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of two parameters.

Mean, Median, Mode

It is a descriptive summary of a data set. It can be defined by using some of the measures. The central tendencies do not provide information regarding individual data from the dataset. However, they give a summary of the data set. The central tendency or measure of central tendency is a central or typical value for a probability distribution.

Z-Scores

A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow comparison between two scores that belong to different normal distributions.

Topic Video

Question

100%

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 = 15.8 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.)
Partial Critical Value Table
A 90% confidence level requires subjects. (Round up to the nearest subject.)
Critical Value, za/2
Level of Confidence,
(1-a) • 100%
How does the decrease in confidence affect the sample size required?
Area in Each Tail,
2
90%
0.05
1.645
O A. Decreasing the confidence level increases the sample size needed.
95%
0.025
1.96
O B. The sample size is the same for all levels of confidence.
99%
0.005
2.575
O C. Decreasing the confidence level decreases the sample size needed.
Print
Done

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 2 steps with 3 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

$Centre, Spread, and Shape of a Distribution$

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, statistics and related others by exploring similar questions and additional content below.

Similar questions

Determine tc for n = 15 and a confidence level of 99%.
Suppose you survey a random sample from a large population to understand the population proportion. How large must your sample be if you want the Margin of Error to be 6% = 0.06 with a confidence level of 98%? (Be sure to show your calculations.) %3D
A histological test for cancer has sensitivity, specificity, positive predictivity, and negative predictivity in excess of 90 percent. Which of the four indicators would you use to reassure a patient that the positive result could be in error? Explain your answer.
If n=300 and x=60, construct a 99% confidence interval estimate for the population proportion.
You intend to estimate a population mean with a confidence interval. You believe the population to have a normal distribution. Your sample size is 51.Find the critical value that corresponds to a confidence level of 95%.
In the population of senior students at Shermer High School, the proportion who plan to attend college is 0.64. In a random sample of 100 students from this population, the proportion who plan to attend college is 0.75. We would call the value 0.64 a P-value. z-score. parameter statistic significance level.
You intend to estimate a population mean with a confidence interval. You believe the population to have a normal distribution. Your sample size is 41.Find the critical value that corresponds to a confidence level of 98%.
One year, the mean age of an inmate on death row was 38.3 years. A sociologist wondered whether the mean age of a death-row inmate has changed since then. She randomly selects 32 death-row inmates and finds that their mean age is 37.3, with a standard deviation of 8.7. Construct a 95% confidence interval about the mean age. What does the interval imply? E Click the icon to view the table of critical t-values. Choose the correct hypotheses. H, Hi: (Type integers or decimals. Do not round.) Construct a 95% confidence interval about the mean age. With 95% confidence, the mean age of a death row inmate is between places as needed.) What does the interval imply?
A poll was conducted that asked 1017 people how many books they had read in the past year. Results indicated that x= 13.9 books ands= 16.6 books. Construct a 95% confidence interval for the mean number of books people read. Click the icon to view the table of areas under the t-distribution. Question Help v Construct a 95% confidence interval for the mean number of books people read. (Use ascending order. Round to two decimal plaçes as needed.) Enter your answer in the edit fields and then click Check Answer. All parts showing Clear All Check Answer P Type here to search 451 PM 4/11/2021 A= 4 de ENG DELL Pgup Delete PrtScr Insert F11 F12 F9 F10 F7 F8 F5 F6 F4 F3 40) Esc F1 F2 Backspace & %3D 24 % 6. 8. 7
You intend to estimate a population mean with a confidence interval. You believe the population to have a normal distribution. Your sample size is 7.Find the critical value that corresponds to a confidence level of 99.9%.
What is the multiplier for an interval that estimates the proportion with a. 88% confidence? b. 98% confidence?
What is the area in each tail when you are calculating a 95% Confidence Interval?