Homework Answers
2. the mean of the sample; the sum of squares for the sample
3.a. comparison of two population means: it measures whether there are differences in the two groups based on the means
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and 2. The variance of a sample depends a. the mean of the sample; the sample...
Please help with the following multiple choice 1. In the one-way ANOVA where there are k...
Please help with the following multiple choice 1. In the one-way ANOVA where there are k treatments and n observations, the degrees of freedom for the F-statistic are equal to, respectively: a. n and k. b. k and n. c. n − k and k − 1. d. k − 1 and n − k. 2. In ANOVA, the F-test is the ratio of two sample variances. In the one-way ANOVA (completely randomized design), the variance used as a numerator...
For the independent-measures t test, which of the following describes the estimated standard error of M1 - M2 (whose sy...
For the independent-measures t test, which of the following describes the estimated standard error of M1 - M2 (whose symbol is )? O The variance across all the data values when both samples are pooled together O A weighted average of the two sample variances (weighted by the sample sizes) O The difference between the standard deviations of the two samples O An estimate of the standard distance between the difference in sample means (M, - M2) and the difference...
For the independent measures ttast, which of the following describes the estimated standard error of the...
For the independent measures ttast, which of the following describes the estimated standard error of the difference in sample means (whose symbolis )? The difference between the standard deviations of the two samples A weighted average of the two sample variances (weighted by the sample stres) An estimate of the standard distance between the difference in sample means (M. - Me) and the difference in the corresponding population means (Hi-Pa) The variance across all the data values when both samples...
Consider the data in the table collected from three independent populations. Sample 1 Sample 2 Sample...
Consider the data in the table collected from three independent populations. Sample 1 Sample 2 Sample 3 a) Calculate the total sum of squares (SST) and partition the SST into its two components, the sum of squares between (SSB) and the sum of squares within (SS) b) Use these values to construct a one-way ANOVA table c) using α-0.05, what conclusions can be made concerning the population means? 14 Click the lcon to view a table of critical F-scores for...
A researcher has two samples of participants, and each sample experiences a different level of the...
A researcher has two samples of participants, and each sample experiences a different level of the independent variable. Sample A has 8 participants and Sample B has 10 participants. The corrected variance for Sample A is 7.71 and the corrected variance for Sample B is 9.34. What is the pooled degrees of freedom between the 2 samples? (hint: you shouldn’t use the pooled variance equation). Find the pooled variance using the pooled variance equation. c . Add the two variance...
A researcher has two samples of participants, and each sample experiences a different level of the...
A researcher has two samples of participants, and each sample experiences a different level of the independent variable. Sample A has 8 participants and Sample B has 10 participants. The corrected variance for Sample A is 7.71 and the corrected variance for Sample B is 9.34. What is the pooled degrees of freedom between the 2 samples? (hint: you shouldn’t use the pooled variance equation). Find the pooled variance using the pooled variance equation. Convert the pooled variance to variance...
Suppose a researcher wants to learn more about the mean attention span of individuals in some...
Suppose a researcher wants to learn more about the mean attention span of individuals in some hypothetical population. The researcher cites that the attention span (the time in minutes attending to some task) in this population is normally distributed with the following characteristics: 20+_36. Based on the parameters given in this example, answer the following questions: a. What is the population mean (μ)? b. What is the population variance? c. Sketch the distribution of this population. Make sure you draw...
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...
Question 25 5 pts Solve the problem. A marketing study was conducted to compare the mean...
Question 25 5 pts Solve the problem. A marketing study was conducted to compare the mean age of male and female purchasers of a certain product. Random and independent samples were selected for both male and female purchasers of the product. What type of analysis should be used to compare the mean age of male and female purchasers? A paired difference comparison of population means. A test of a single population mean An independent samples comparison of population proportions. An...
1.) Problem: You are applying for jobs after graduating and are looking at a particular company....
1.) Problem: You are applying for jobs after graduating and are looking at a particular company. You've heard that they don't pay women as much as men starting out and want to test it at the p<.01 level before deciding to work there. Luckily you are able to get publicly available salary information and randomly select the starting salary of 7 women and 6 men to see if women are paid less than men at this company. The salaries of...
For the independent-measures t test, which of the following describes the estimated standard error of M1 - M2 (whose symbol is )? O The variance across all the data values when both samples are pooled together O A weighted average of the two sample variances (weighted by the sample sizes) O The difference between the standard deviations of the two samples O An estimate of the standard distance between the difference in sample means (M, - M2) and the difference...
For the independent measures ttast, which of the following describes the estimated standard error of the difference in sample means (whose symbolis )? The difference between the standard deviations of the two samples A weighted average of the two sample variances (weighted by the sample stres) An estimate of the standard distance between the difference in sample means (M. - Me) and the difference in the corresponding population means (Hi-Pa) The variance across all the data values when both samples...
Consider the data in the table collected from three independent populations. Sample 1 Sample 2 Sample 3 a) Calculate the total sum of squares (SST) and partition the SST into its two components, the sum of squares between (SSB) and the sum of squares within (SS) b) Use these values to construct a one-way ANOVA table c) using α-0.05, what conclusions can be made concerning the population means? 14 Click the lcon to view a table of critical F-scores for...
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...
Question 25 5 pts Solve the problem. A marketing study was conducted to compare the mean age of male and female purchasers of a certain product. Random and independent samples were selected for both male and female purchasers of the product. What type of analysis should be used to compare the mean age of male and female purchasers? A paired difference comparison of population means. A test of a single population mean An independent samples comparison of population proportions. An...
1.) Problem: You are applying for jobs after graduating and are looking at a particular company. You've heard that they don't pay women as much as men starting out and want to test it at the p<.01 level before deciding to work there. Luckily you are able to get publicly available salary information and randomly select the starting salary of 7 women and 6 men to see if women are paid less than men at this company. The salaries of...
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