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Student's t-Test

Conducting a One-Sample t-Test

Scenario: Steven collected data from 20 college students on their emotional responses to classical music. Students listened to two 30-second segments from "The Collection from the Best of Classical Music." After listening to a segment, the students rated it on a scale from 1 to 10, with 1 indicating that it "made them very sad"

Critical and Computed Values for a T Test

Suppose that, for a t test, your computed value for t is +3.28. The critical value of t is +2.048. Explain what this means. Do you reject the null hypothesis or not? Now suppose that you have 28 degrees of freedom and are using a two-tailed (nondirectional) test. Draw a simple figure to illustrate the relationship between the cr

T-Distribution and Degree of Freedom

Use the t-distribution table to find the critical value(s) for the indicated alternative hypothesis, level of significance ?, and sample sizes n? and n?. Assume that the samples are independent, normal, and random. H?: µ? < µ?, ? = 0.05, n? = 14, n? = 13 (a) Find the critical value(s) assuming the population variances

Degree of Freedom and T-Distribution

Use the t-distribution table to find the critical value(s) for the indicated alternative hypothesis, level of significance ?, and sample sizes n? and n?. Assume that the samples are independent, normal, and random. Answer parts (a) and (b). H?: µ? ? µ?, ? = 0.10, n? = 14, n? = 13 (a) Find the critical value(s) assuming the

Evaluating Researcher's Claim using a Two-Tailed T-Test

A researcher is interested in comparing the response times of two different cab companies. Companies A and B were each called at 50 randomly selected times. The calls to company A were independently made from the calls to company B. Company A had a mean response time of 8.5 minutes with a standard deviation of 1.8 minutes. Compa

Completing a T-Test

137 113 117 117 Using the data sets provided, 105 105 a. Using a two sample t-test, test if the two data sets are significantly different. 138 135 b. Using a Matched Pairs T-test (also called paired sample t-test in Excel) test if the two data sets are significantly different 101 108 c. Using a Sign Test (non-p

Independent samples

Downs and Abwender (2002) evaluated soccer players and swimmers to determine whether the routine blows to the head experienced by soccer players produced long-term neurological deficits. In the study, neurological tests were administered to mature soccer players and swimmers and the results indicated significant differences. I

Independent- or related-samples t test

Create a real-world situation or problem involving children who have ADHD. Within state the independent and dependent variables you would study, an explanation of whether an independent-samples or related-samples t test is most appropriate, the statistical null and alternative hypotheses, a description of what information the ef

Paired T Test: Testing Samples of Runners After A Race

A running coach wanted to see whether runners ran faster after eating spaghetti the night before. A group of six runners was randomly chosen for this study. Each ran a 5 kilometer race after having a normal dinner the night before, and then a week later, reran the same race after having a spaghetti dinner the night before. The t

T-Test: Examining the Humour on Interpersonal Attraction

In studies examining the effect of humour on interpersonal attraction, McGee and Shevlin (2009) found that an individual's sense of humor had a significant effect on how the individual was perceived by others. In one part of the study, female college students were given brief descriptions of a potential romantic partner. The f

Solar cells are attached to a panel with a new heat resistant adhesive. The adhesive must provide 2.80 pounds of force in order to hold the cell on the panel. A random sample of 50 cells is tested and the following forces are necessary to break the adhesive.

Please show all work. Solar cells are attached to a panel with a new heat resistant adhesive. The adhesive must provide 2.80 pounds of force in order to hold the cell on the panel. A random sample of 50 cells is tested and the following forces are necessary to break the adhesive. 2.65 2.76 2.82 2.89 2.95 2.67 2.77 2.83 2.

Exercise 31 t- Test for Dependent Groups

The t-test for dependent groups is a parametric analysis technique used to determine statistical differences between two related samples or groups. Groups are dependent or related because they were matched as part of the design to ensure similarities between the two groups and thus reduce the effect of extraneous variables. For

Conduct a dependent t test

A veterinary nutritionist developed a diet for overweight dogs. The total volume of food consumed remains the same, but one-half of the dog food is replaced with a low-calorie "filler" such as canned green beans. Six overweight dogs were randomly selected from her practice and were put on this program. Their initial weights wer

Paired Sample Procedure

** Please see the attachment for the complete problem description ** Using the data in the Excel file..., test the hypotheses that the mean difference in writing and reading is zero, and that the mean difference in math and science is zero. Use the paired sample procedure.

One Tailed t Test for Hypothesis Test

I need help with the following: A small shirt producer, is concerned that the mean weight of their classic shirt is not greater than 3.0 pounds. It can be assumed that the population standard deviation is .9 pounds based on past experience. A sample of 310 hats is selected and the sample mean is 3.15 pounds. Using a level of

Hypothesis Test for Equal Variances

For the attached spreadsheet assume equal variances for the two populations. A) Test the null hypothesis that the average length of service for males is the same as for females. B) Test the null hypothesis that the average length of service for individuals without prior call center experience is the same as those with experi

T-Test Question

Twenty students randomly assigned to an experimental group receive an instructional program; 30 in a control group do not. After 6 months, both groups are tested on their knowledge. The experimental group has a mean of 38 on the test (with an estimated population standard deviation of 3); the control group has a mean of 35 (with

Two Tail T test for Correlation Coefficient

X 38 61 38 49 44 Y 57 42 44 55 28 a) construct scatter diagram b) compute linear correlation coefficient c) comment on relationship -positive linear association -negative linear association -little to no evidence of a linear association.

Comparison of two means - the t-test

One of the most commonly used statistical techniques is the comparison of two means, also known as the t-test (for this you need quantitative, or interval level data). If you used the same data to compare means with equal sample sizes, how would the results compare if you used the paired sample, independent sample equal varianc

Independent Sample T-Test For Eating Speed

Billie wishes to test the hypothesis that overweight individuals tend to eat faster than normal-weight individuals. To test this hypothesis, she has two assistants sit in a McDonald's restaurant and identify individuals who order the Big Mac special for lunch. The Big Mackers as they become known are then classified by the ass

One Sample t-Test on Hypothesis

Steven collected data from 20 college students on their emotional responses to classical music. Students listened to two 30-second segments from "The Collection from the Best of Classical Music." After listening to a segment, the students rated it on a scale from 1 to 10, with 1 indicating that it "made them very sad" to 10 in

T-Test

Answers must be written in Microsoft Word.

T-Test

Any conclusion drawn for the t-test statistical process is only as good as the research question asked and the null hypothesis formulated. T-tests are only used for two sample groups, either on a pre post-test basis or between two samples (independent or dependent). The t-test is optimized to deal with small sample numbers which

research study

Statistical Technique in Review The t-test for dependent groups is a parametric analysis technique used to determine statistical differences between two related samples or groups. Groups are dependent or related because they were matched as part of the design to ensure similarities between the two groups and thus reduce the ef

Performing an Independent T-Test

Management at the Mall of Elbonia wanted to determine how much time customers spend at the mall. Four surveys were administered on four different days by randomly selecting individuals as they were returning from the mall to the parking lot, and asking them to participate. One of the questions asked was how much time the custome

Suggest one psychological research question.

Suggest one psychological research question that could be answered by each of the following types of statistical test: * z test * t test for independent samples, and t test for dependent samples

independent t test for battery life span

Compare the lives of generic batteries to the lives of brand name batteries using the given data. Battery Number Life of the Battery (in hours) Battery Type 1 194.0 Brand Name 2 205.5 Brand Name 3 199.2 Brand Name 4 172.4 Brand Name 5 184.0 Brand Name 6 169.5 Brand Name 7 190.7 Generic 8 203.5 Generic 9 203.5 Gener

Find the test t-statistic.

The changing ecology of the swamps in Louisiana has been the subject of much environmental research. One water-quality parameter of concern is the total phosphorous level. Suppose that the EPA makes 15 measurements in one area of the swamp, yielding a mean level of total phosphorus of 12.3 parts per billion (ppb) and a standard