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 comparing the two population proportions.
True or False? If the population variances are exactly equal for two populations, the F statistic based on two sample variances will be very close to zero.
Homework Answers
Add Answer to:
True or False? when sample data occurs in pairs, an advantage of
choosing a paired t-test...
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...
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
Now suppose a larger sample (30 pairs vs 10 pairs) was collected and a paired t test was used to analyze the data. The...
Now suppose a larger sample (30 pairs vs 10 pairs) was collected and a paired t test was used to analyze the data. The output is shown below. Paired Samples Statistics Mean N Std. Deviation Std. Error Mean Pair 1 Female salaries 6773.33 30 782.099 142.791 Male salaries 7213.33 30 875.227 159.794 Paired Samples Correlations N Correlation Sig. Pair 1 Female salaries & Male salaries 30 .881 .000 Paired Samples Test Paired Differences t df Sig. (2-tailed) Mean Std. Deviation...
when variances between two samples are not equal in a paired sample t test, the pooled...
when variances between two samples are not equal in a paired sample t test, the pooled variance must be computed and used 8n place of the estimated standard error. t or f
When the necessary conditions are met, a two-tailed test is being conducted to test the difference...
When the necessary conditions are met, a two-tailed test is being conducted to test the difference between two population proportions. The two sample proportions are p1hat=0.052 and p2hat=0.023 and the standard error of the sampling distribution of p1-p2 is 0.0085. The calculated value of the test statistic will be z = 3.41. A. True B. False
(Exercise 11.1(Algorithmic)) Consider the following results for independent samples taken from two populations Sample 1 1...
(Exercise 11.1(Algorithmic)) Consider the following results for independent samples taken from two populations Sample 1 1 400 P1 0.45 Sample 2 300 p2 0.34 a. What id the point estimate of the difference between the two population proportions (to 2 decimals)i b Develop a 90% confidence interval for the difference between the two population proportions to 4 decimals to C. Develop a 95% confidence interval for the difference between the two population proportions (to 4 decimals). to Consider the hypothesis...
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...
this is not a true or false 4) In order to test the difference in populations...
this is not a true or false
4) In order to test the difference in populations means, samples were collected for two independent populations where the variances are assumed equal and the population normally distributed. The following data resulted. Find the value of the pooled variance ad 99% CI. Population 1 Population 2 - 107 x 112 s 14 n 25 - 28
Consider the following results for independent samples taken from two populations. Sample 1 Sample 2 ni...
Consider the following results for independent samples taken from two populations. Sample 1 Sample 2 ni = 400 n2= 300 P1= 0.44 P2= 0.36 a. What is the point estimate of the difference between the two population proportions (to 2 decimals)? b. Develop a 90% confidence interval for the difference between the two population proportions (to 4 decimals). Use z-table. to c. Develop a 95% confidence interval for the difference between the two population proportions (to 4 decimals). Use z-table....
Question 21 In testing Ho: p1" p,-0 versus Ha: p1" p. 0, the computed value of...
Question 21 In testing Ho: p1" p,-0 versus Ha: p1" p. 0, the computed value of the test statistic is z = 2 25 The P value for this two-tailed test is then Not yet answered Points out of 6.00 Flag question Question 22 Not yet answered Points out of 4.00 The two-sample t test is applicable in situations in which population distributions are both normal when population variances have unknown values, and at least one of the two sample...
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...
(Exercise 11.1(Algorithmic)) Consider the following results for independent samples taken from two populations Sample 1 1 400 P1 0.45 Sample 2 300 p2 0.34 a. What id the point estimate of the difference between the two population proportions (to 2 decimals)i b Develop a 90% confidence interval for the difference between the two population proportions to 4 decimals to C. Develop a 95% confidence interval for the difference between the two population proportions (to 4 decimals). to Consider the hypothesis...
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...
this is not a true or false
4) In order to test the difference in populations means, samples were collected for two independent populations where the variances are assumed equal and the population normally distributed. The following data resulted. Find the value of the pooled variance ad 99% CI. Population 1 Population 2 - 107 x 112 s 14 n 25 - 28
Consider the following results for independent samples taken from two populations. Sample 1 Sample 2 ni = 400 n2= 300 P1= 0.44 P2= 0.36 a. What is the point estimate of the difference between the two population proportions (to 2 decimals)? b. Develop a 90% confidence interval for the difference between the two population proportions (to 4 decimals). Use z-table. to c. Develop a 95% confidence interval for the difference between the two population proportions (to 4 decimals). Use z-table....
Question 21 In testing Ho: p1" p,-0 versus Ha: p1" p. 0, the computed value of the test statistic is z = 2 25 The P value for this two-tailed test is then Not yet answered Points out of 6.00 Flag question Question 22 Not yet answered Points out of 4.00 The two-sample t test is applicable in situations in which population distributions are both normal when population variances have unknown values, and at least one of the two sample...
Most questions answered within 3 hours.
-
Of all the different weapons discussed in this chapter that make
up CBRNE,
Which group do...
asked 10 minutes ago -
Floating Point Representation
Consider a computer that stores information using 10 bits words.
The first bit...
asked 4 minutes ago -
Draw the molecular orbital diagram for O2-
(oxygen molecule with a negative charge).
asked 13 minutes ago -
Given the following JavaScript code, what will be displayed on
the web page?
var x =...
asked 21 minutes ago -
The cynics, skeptics, epicureans, & stoics were most
philosophies that dealt with:
a. the physical...
asked 22 minutes ago -
The hydronium ion concentration of an aqueous solution of 0.333
M trimethylamine (a weak base with...
asked 24 minutes ago -
A buffer is prepared by partially titrating 50.00 mL of 0.964 M
benzoic acid using 0,100...
asked 27 minutes ago -
For a Generalized Additive Model, what does a large
edf(empirical distribution function) value mean?
Thank you...
asked 40 minutes ago -
questions for Biology lab
An agarose gel electrophoresis assay performed with high quality
will NOT have...
asked 44 minutes ago -
A spring with spring constant 400 N/m is anchored at the bottom
of a frictionless 30^∘...
asked 48 minutes ago -
The half-life of 238U is 4.5×109 yr.
Find the number of disintegrations per hour emitted by...
asked 57 minutes ago -
y[n] = x[n] - 3x[n - 1] + 4x[n - 2]
What is the transfer function...
asked 1 hour ago