Cholesterol levels are measured on a random sample of 1,000 persons and sample standard deviation is...
Cholesterol levels are measured on a random sample of 1,000 persons and sample standard deviation is calculated and standard error of the sample mean is also calculated. Suppose a second survey were repeated in the SAME population, but the sample size tripled to 3,000 persons.
1. The sample standard deviation of the second sample is going to be smaller than that of the first sample.
A. True
B. False
2. The sample mean of the second sample is going to be larger than that of the first sample.
A. True
B. False
3. The standard error of the sample mean for the second sample is going to be smaller than that of the first sample.
A. True
B. False
Homework Answers
Add Answer to:
Cholesterol levels are measured on a random sample of 1,000
persons and sample standard deviation is...
1- Assume the cholesterol levels in a certain population have mean u- 200 and standard deviation...
1- Assume the cholesterol levels in a certain population have mean u- 200 and standard deviation σ 24. The cholesterol levels for a random sample of n individuals are measured and the sample mean x is determined. What is the z-score for a sample mean x - 180? (a) reject the null if the calculated Z> 1.96 (b) reject the null ifthe calculated Z#196 (c) do not reject the null if lcalc zl is <1.96 (d) reject the null if...
Elevated cholesterol levels pose a risk of heart disease. For 20 – 74-year-olds males in the...
Elevated cholesterol levels pose a risk of heart disease. For 20 – 74-year-olds males in the United States, cholesterol level is normally distributed. Cholesterol levels above 220 are considered to of moderate risk. Health officials feel cholesterol levels of male college students may be of concern because of diet or lack of exercise. To test this premise, the cholesterol levels of 13 male students in three different classes at Montgomery College were measured and found to have a mean of...
The serum cholesterol levels for 20-24 year old males in the US has mean 180 mg/100ml...
The serum cholesterol levels for 20-24 year old males in the US has mean 180 mg/100ml and standard deviation σ = 46 mg/100ml. We are interested in the mean cholesterol level of the larger population of 20-74 old males, say µ. Suppose, we have a random sample of size 25 from the larger population. We want to test the following hypotheses at significance level α = 0.01: H0 : µ = 180, HA : µ > 180 a) What is...
Population A has a larger standard deviation than Population B. If samples of equal size are...
Population A has a larger standard deviation than Population B. If samples of equal size are taken from both populations, which sample will have a smaller standard error of the mean? a. Unable to determine with provided information b. the sample from Population B c. the sample from Population A d. The samples will have the same standard error of the mean
The total cholesterol levels of a sample of men aged 35-44 are normally distributed with a...
The total cholesterol levels of a sample of men aged 35-44 are normally distributed with a mean of 209 milligrams per deciliter and a standard deviation of 36.8 milligrams per deciliter. (a) What percent of the men have a total cholesterol level less than 233 milligrams per deciliter of blood? (b) If 259 men in the 35-44 age group are randomly selected, about how many would you expect to have a total cholesterol level greater than 257 milligrams per deciliter...
A random sample of 250 persons yields a sample mean of 110 and a sample standard...
A random sample of 250 persons yields a sample mean of 110 and a sample standard deviation of 10. Construct three different confidence intervals to estimate the population mean, using 95%, 99%, and 99.9% levels of confidence. What happens to the interval width as the confidence level increases? Why?
An independent random sample is selected from an approximately normal population with an unknown standard deviation....
An independent random sample is selected from an approximately normal population with an unknown standard deviation. a) Given the sample mean = 24.3, sample standard deviation = 8.5, and sample size = 32, compute the standard error. The standard error = b) Using a confidence coefficient of 2.04, compute the confidence interval. The 95% confidence interval goes from to (Enter the smaller number first.) c) Based on the confidence interval above, which of the following values are plausible? (Choose all...
(C) If the confidence levels were 99.5% rather than 99.9% would the margin of error be...
(C) If the confidence levels were 99.5% rather than 99.9% would
the margin of error be larger or smaller than the result in part
(a) ? Explain.
The margin of error would be ( larger or smaller ) , since ( an
increase or a decrease ) in the confidence level will ( decrease or
increase ) the critical value z a/2.
SAT scores: A college admissions officer takes a simple random sample of 100 entering freshmen and computes their...
PPH4801/MPHDHM9 Jan/Feb 2018 16 A study of 100 pabents is perfomed to determine f cholesterol levels...
PPH4801/MPHDHM9 Jan/Feb 2018 16 A study of 100 pabents is perfomed to determine f cholesterol levels are lowered after 3 months of taking a new drug Cholesterol levels are measured on each individual at the beginning of the study and 3 months later The cholesterol change is calculated the value at 3 months minus the value at the beginning of the study On average the cholesterol levels among these 100 patents decreased by 150 and the standard deviation of the...
Assume total cholesterol levels (TChol) are normally distributed with mean μ = 215 mg/dl and standard...
Assume total cholesterol levels (TChol) are normally distributed with mean μ = 215 mg/dl and standard deviation σ = 30 mg/dl for the adult American population. That is, TChol ~ N(215, 302). Total cholesterol values of 240 mg/dl or greater are considered high; and levels in the range of 200 to 240 are called borderline high. a. What proportion of this population do we expect to find with high cholesterol? What proportion do we expect to find with borderline high...
1- Assume the cholesterol levels in a certain population have mean u- 200 and standard deviation σ 24. The cholesterol levels for a random sample of n individuals are measured and the sample mean x is determined. What is the z-score for a sample mean x - 180? (a) reject the null if the calculated Z> 1.96 (b) reject the null ifthe calculated Z#196 (c) do not reject the null if lcalc zl is <1.96 (d) reject the null if...
The total cholesterol levels of a sample of men aged 35-44 are normally distributed with a mean of 209 milligrams per deciliter and a standard deviation of 36.8 milligrams per deciliter. (a) What percent of the men have a total cholesterol level less than 233 milligrams per deciliter of blood? (b) If 259 men in the 35-44 age group are randomly selected, about how many would you expect to have a total cholesterol level greater than 257 milligrams per deciliter...
An independent random sample is selected from an approximately normal population with an unknown standard deviation. a) Given the sample mean = 24.3, sample standard deviation = 8.5, and sample size = 32, compute the standard error. The standard error = b) Using a confidence coefficient of 2.04, compute the confidence interval. The 95% confidence interval goes from to (Enter the smaller number first.) c) Based on the confidence interval above, which of the following values are plausible? (Choose all...
(C) If the confidence levels were 99.5% rather than 99.9% would
the margin of error be larger or smaller than the result in part
(a) ? Explain.
The margin of error would be ( larger or smaller ) , since ( an
increase or a decrease ) in the confidence level will ( decrease or
increase ) the critical value z a/2.
SAT scores: A college admissions officer takes a simple random sample of 100 entering freshmen and computes their...
PPH4801/MPHDHM9 Jan/Feb 2018 16 A study of 100 pabents is perfomed to determine f cholesterol levels are lowered after 3 months of taking a new drug Cholesterol levels are measured on each individual at the beginning of the study and 3 months later The cholesterol change is calculated the value at 3 months minus the value at the beginning of the study On average the cholesterol levels among these 100 patents decreased by 150 and the standard deviation of the...
Most questions answered within 3 hours.
-
the following reaction occurs in a balloon containing
N2O2 gas
N2O4(g)=2NO2(g)
will the volume of the...
asked 8 minutes ago -
answer the questions throughout this program
public class Day implements Comparable {
Private Boolean atWork;...
asked 15 minutes ago -
This is C++ code for parking fee management program
#include <iostream>
#include <iomanip>
using namespace std;...
asked 26 minutes ago -
The free energy change for the following reaction at 25 °C, when
[Sn2+] = 1.17 M...
asked 2 hours ago -
An MNE is this kind of industry when competition in one country
is essentially independent of...
asked 3 hours ago -
. For this set of questions, determine what
proportion of a normal distribution is located betweeneach...
asked 4 hours ago -
A college student is employed as a door-to-door newspaper
salesman. Historical data suggests that the student...
asked 5 hours ago -
MATLAB HW 11 problem using Switch Case and Input commands
Write a script file that calculates...
asked 4 hours ago -
Considering gravitational time dilation, calculate the time that
passes in Earth’s surface while 1 hour passes...
asked 5 hours ago -
Minitab Problem: Take the Lake Hume June rainfall data and find
use the processes outlined in...
asked 6 hours ago -
X Company is trying to decide whether to continue using old
equipment to make Product A...
asked 6 hours ago -
IN PYTHON ONLY !! Program 2: Re-work
program #5 (WeeklyHours) from the previous assignment such that...
asked 7 hours ago