True or false? When the population variances are known, the test statistic that we use to...
True or false? When the population variances are known, the test statistic that we use to compare two population means using two independent samples follows the standard normal distribution.
True or false? A paired t-test with two columns of 8 observations in each column should use d.f =7
Homework Answers
1) True
When population variances are known then we use the Standard Normal Distribution .
2) False
This is the false statement in this case the degree of freedom will depend on the sample standard deviation as well.so we can't use d.f.=7
Add Answer to:
True or false? When the population variances are known, the test
statistic that we use to...
True or False? when sample data occurs in pairs, an advantage of choosing a paired t-test...
True or False? when sample data occurs in pairs, an advantage of choosing a paired t-test is that it tends to increase the power of a test, as compared to treating each sample independently. True or False? When testing the difference between two population proportions, it is necessary to use two samples with the same sample size. True or False? If the sample proportions are p1=6/90 and p2=4/100, we can assume normality for the two sample proportions in a test...
1. When do we use an independent groups t-test? a. b. c. d. When we are...
1. When do we use an independent groups t-test? a. b. c. d. When we are comparing means from one sample that has been measured twice. When we are comparing means from two different samples. When we are comparing a sample mean to a population mean. When we are comparing two population means. 2. Which of the following is true regarding the use of t-tests for true experiments versus quasi-experimental designs? a. b. We use the same t-test whether it...
In comparing two population means, an unpaired test provides more precise results than a paired test...
In comparing two population means, an unpaired test provides more precise results than a paired test because the unpaired test uses two independent samples while the paired test uses a single sample. True O False Question 2 1 pts When comparing two population means, if the variations which are unique to each population are very small compared to the variations which are common to both populations, it is reasonable to assume that the population standard deviations are not equal. O...
1. Why do we need different formulas to calculate test statistics and obtain p-values? Select all...
1. Why do we need different formulas to calculate test statistics and obtain p-values? Select all that apply. V The choice of test statistic depends on whether data is randomly sampled or not; this determines the sampling distribution. The choice of test statistic is arbitrary, choose whichever seems easiest to use at the time. The choice of test statistic is up to the statistician. We can choose any of the given test statistics to test any of the hypotheses so...
In "Small Independent samples about Population Mean" case, we usually assume the variances from the two...
In "Small Independent samples about Population Mean" case, we usually assume the variances from the two samples are "Equal" in scales. Therefore, we use the smaller standard deviation (or variance) found from the two samples to calculate the test statistic. use the larger standard deviation (or variance) found from the two samples to calculate the test statistic. calculate the average the two standard deviations (or variances) and use it to calculate the test statistic. calculate the pooled standard deviation (or...
When should I use the Paired t-test? Remember that some tests, such as chi squared, can...
When should I use the Paired t-test? Remember that some tests, such as chi squared, can be used under various circumstances. The goal of the test changes based on the situation. Pay attention to the specific conditions noted in parenthesis to ensure you are picking the correct goal. A. Compare two treatments consisting of paired data where a normal distribution can be assumed B. Test the fit of the normal distribution to the data set. C. Compare two treatment groups...
QUESTION 2 When shouldI use the Welch's t-test? Remember that some tests, such as chi squared,...
QUESTION 2 When shouldI use the Welch's t-test? Remember that some tests, such as chi squared, can be used under various circumstances. The goal of the test changes based on the situation. Pay attention to the specific conditions noted in parenthesis to ensure you are picking the correct goal Compare categorical frequency data with an expected population proportion. No difference between observed and expected proportions is used as the null hypothesis B. More than two treatment groups where a normal...
TRUE or FALSE? WHY? 1) When the test statistic is t and the number of degrees...
TRUE or FALSE? WHY? 1) When the test statistic is t and the number of degrees of freedom is > 30, the critical value of t is very close to that of z (the standard normal). 2) The t-test can be applied with absolutely no assumptions about the distribution of the population.
comparing the means of twoindependent population when the population variances are known andunknown1....
Comparing the means of two
independent population when the population variances are known and
unknownSuppose you conduct a study and intend to use a hypothesis test to compare the means of two independent populations. Your null hypothesis is that the two means are equal. That is, \(\mathrm{H}_{0}: \mu_{1}=\mu_{2}\), or equivalently, \(\mathrm{H}_{0}: \mu_{1}-\mu_{2}=0\). Following is a table of the information you gather. Assume the populations from which your samples are drawn are both normally distributed.Sample SizeSample MeanSample VarianceSample 1n_(1)=41bar(x)_(1)=14.3s_(1)^(2)=67.24Sample 2n_(2)=21bar(x)_(2)=13.6s_(2)^(2)=46.24
When should I use the One-sample t-test? Remember that some tests, such as chi squared, can...
When should I use the One-sample t-test? Remember that some tests, such as chi squared, can be used under various circumstances. The goal of the test changes based on the situation. Pay attention to the specific conditions noted in parenthesis to ensure you are picking the correct goal. A. Test the fit of the normal distribution to the data set. B. Compare two treatment groups consisting of independent samples with a normal distribution AND unequal variance. C. Test to see...
1. When do we use an independent groups t-test? a. b. c. d. When we are comparing means from one sample that has been measured twice. When we are comparing means from two different samples. When we are comparing a sample mean to a population mean. When we are comparing two population means. 2. Which of the following is true regarding the use of t-tests for true experiments versus quasi-experimental designs? a. b. We use the same t-test whether it...
In comparing two population means, an unpaired test provides more precise results than a paired test because the unpaired test uses two independent samples while the paired test uses a single sample. True O False Question 2 1 pts When comparing two population means, if the variations which are unique to each population are very small compared to the variations which are common to both populations, it is reasonable to assume that the population standard deviations are not equal. O...
1. Why do we need different formulas to calculate test statistics and obtain p-values? Select all that apply. V The choice of test statistic depends on whether data is randomly sampled or not; this determines the sampling distribution. The choice of test statistic is arbitrary, choose whichever seems easiest to use at the time. The choice of test statistic is up to the statistician. We can choose any of the given test statistics to test any of the hypotheses so...
In "Small Independent samples about Population Mean" case, we usually assume the variances from the two samples are "Equal" in scales. Therefore, we use the smaller standard deviation (or variance) found from the two samples to calculate the test statistic. use the larger standard deviation (or variance) found from the two samples to calculate the test statistic. calculate the average the two standard deviations (or variances) and use it to calculate the test statistic. calculate the pooled standard deviation (or...
When should I use the Paired t-test? Remember that some tests, such as chi squared, can be used under various circumstances. The goal of the test changes based on the situation. Pay attention to the specific conditions noted in parenthesis to ensure you are picking the correct goal. A. Compare two treatments consisting of paired data where a normal distribution can be assumed B. Test the fit of the normal distribution to the data set. C. Compare two treatment groups...
QUESTION 2 When shouldI use the Welch's t-test? Remember that some tests, such as chi squared, can be used under various circumstances. The goal of the test changes based on the situation. Pay attention to the specific conditions noted in parenthesis to ensure you are picking the correct goal Compare categorical frequency data with an expected population proportion. No difference between observed and expected proportions is used as the null hypothesis B. More than two treatment groups where a normal...
Comparing the means of two
independent population when the population variances are known and
unknownSuppose you conduct a study and intend to use a hypothesis test to compare the means of two independent populations. Your null hypothesis is that the two means are equal. That is, \(\mathrm{H}_{0}: \mu_{1}=\mu_{2}\), or equivalently, \(\mathrm{H}_{0}: \mu_{1}-\mu_{2}=0\). Following is a table of the information you gather. Assume the populations from which your samples are drawn are both normally distributed.Sample SizeSample MeanSample VarianceSample 1n_(1)=41bar(x)_(1)=14.3s_(1)^(2)=67.24Sample 2n_(2)=21bar(x)_(2)=13.6s_(2)^(2)=46.24
Most questions answered within 3 hours.
-
Q1b. Provide an example of how pricing should interact
with the services offered by the retailer.
asked 3 minutes ago -
a mass weighing 8 pounds when attached to a spring, stretches
it 6 inches.the object is...
asked 10 minutes ago -
The following is part of the computer output from a regression
of monthly returns on Waterworks...
asked 15 minutes ago -
Bob Katz is purchasing a new Honda Pilot for $35,000. He is
financing $30,000 with a...
asked 18 minutes ago -
The equity holders of Super Nova, Inc. have 100 million of
equity in the firm. Because...
asked 17 minutes ago -
A sample of 240 observations is selected from a normal
population with a population standard deviation...
asked 33 minutes ago -
Write an (efficient) pseudocode for the implementation of each
of the following function prototypes (proper C...
asked 33 minutes ago -
Klingon Widgets, Inc., purchased new cloaking machinery three
years ago for $5.6 million. The machinery can...
asked 36 minutes ago -
Social work's goal of social betterment implies
A. That social workers should be models of good...
asked 33 minutes ago -
a
12 kg box sits on a horizontal table. a string with tension 30.4 N
pulls...
asked 35 minutes ago -
A circular coil of radius 0.120 m contains a single turn and is
located in a...
asked 47 minutes ago -
help me out
Velocity v = גf, wavelength ג = v/f and
Relative frequency = frequency...
asked 55 minutes ago