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Student's t-Test

Calculating degrees of freedom, t-tests and critical values

Suppose that a one-tailed t-test is being applied to find out if the population mean is less than $212. The level of significance selected is 0.01 and 26 accounts are sampled. What is the critical value? A machine is set to fill the small size packages of M&M candies with 56 candies per bag. A sample revealed: 3 bags of 5

T test and confidence interval

The data that you will be using for this exercise came from a survey of two insurance carriers. The first carrier (C1) was compared against the second competitor (C2). The insurance company management team wants to know how Carrier 1 compared to the second carrier. Data from 159 respondents are included. All of the 5 quest

Testing for Equality of Means of Two Populations

You are provided with the male and female unemployment data for the 1960-2005 periods. Using these two samples, determine whether the data support the conclusion that female unemployment rate is higher than the male unemployment rate. Use 0.01 level of significance. INSTRUCTIONS 1. Go to the blackboard, assignment section a

Statistics - Business Administration department

The Business Administration department at a local university delivers some of its courses using online instruction. Of the two statistics courses offered, one is delivered online and the other is delivered on campus. Eighteen pairs of students are selected, who are well matched on a number of years and grades of mathematics cour

Research and Statistics - T-test

A hypothesis states a difference exists between two populations. Sometimes this is an obvious conclusion because the means will be very different. For example, if I gave math tests to boys and girls and the boys on average scored 20 points better than the girls, I know that is enough of a difference to conclude with accuracy tha

T-Test

If a regression coefficient passes the t-test, it means that a. the regression equation is valid. b. the regression coefficient is significantly different from zero. c. the regression coefficient can be used for forecasting. d. the regression coefficient should be included in the regression equation.

Statistics Question

Compare the two-sample independent t test to the paired t test. Can you please compare and contrast this for me?

Statistics

Using AIU's large database of survey responses from the AIU data set, complete the following: Perform hypothesis testing on one variable's data. (Choose either the intrinsic or extrinsic column.) Perform a t-test by formulating a null and an alternative statement, choosing an acceptable significance value, selecting the test

Step by step method for testing the hypothesis under 5 step approach is discussed here. Excel template for each problem is also included. This template can be used to obtain the answers of similar problems.

It seems these days that college graduates who are employed full-time work more than 40-hour weeks. Data are available that can help us decide if this is true. A survey was recently sent to a group of adults selected at random. There were 15 respondents who were college graduates employed full-time. The mean number of hours work

T test for the usage for cable television and radio.

In recent years, a growing array of entertainment option competes for consumer time. By 2004, cable television and radio surpassed broadcast television, recorded music, and the daily newspaper to become the two entertainment media with the greatest usage. Researchers used a sample of 15 individuals and collected data on the hour

Comparisons, Inferences Involving Means

Periodically Merrill Lynch customers are asked to evaluate Merrill Lynch¯Financial consultants and services (2000 Merrill Lynch Client Satisfactory Survey). Higher ratings on the client satisfaction survey indicate better service with 7 the maximum service rating. Independent samples of service ratings for two ¯Financial cons

Basic Statistics Problem

If anyone could walk me through the below problem it would be greatly appreciated! Thanks, Brian A magazine is considering the launch of an online edition. The magazine plans to go ahead only if it's convinced that more than 25% of current readers would subscribe. The magazine contacts a simple random sample of 500 curr

Managerial Decision Making - Statistics Problem

The amount of money out of income spent on housing is an important component of the cost of living. The total costs of housing for homeowners might include mortgage payments, property taxes, and utility costs (water, heat, electricity). An economist selected a sample of 20 homeowners in New England and then calculated these tota

Perform a one-tailed test

A personal computer manufacturer is interested in comparing assembly times for two keyboard assembly processes. Process 1 is the standard process used for several years, and Process 2 is an updated process hoped to bring a decrease in assembly time. Assembly times can vary considerably from worker to worker, and the company deci

Simple random sample / assumed population mean

A shipment of crankshafts is believed to be defective. A simple random sample of 16 is drawn from a large shipment. Check to see if the sample is any different from the assumed population mean of 224. 224.12 223.960 224.098 224.001 224.089 224.057 224.017 223.987 223.913 223.982 223.976 223.999 223.989 223.902 2

Efficacy of Workout Programs

As a researcher I would like to evaluate the effectiveness of the workout programs purchased. This done by comparing the weight loss for a sample size of n=1 person who uses the bean workout program for a period of 5 days a week, and for a sample size of n=1 who uses the x90u workout program for a period of 3 days a week. At t

Statistics Questions

1. What factor determines whether you should use a z-score or a t statistic for a hypothesis test? 2. Several factors influence the value obtained for a t statistic. Some factors affect the numerator of the t statistic and others influence the size of the estimated standard error in the denominator. For each of the following

Statistics: students t test for hypothesis testing

The average electric bill for residents of Anderson creek is at least 52.98 per month. Develop the appropriate null and alternative hypothesis. What is the type I error in this situation? What is the type II error in this situation? Full time PhD students receive an average salary of 12, 837 according to the US Department of

Traditional or p-value method

The average annual rent for office space in Tampa was 17.63 per square foot. A real estate agent selected a random sample of 15 rental properties and found that the mean rent was 18.72 per square foot, and the standard deviation was 3.64. At ?=.05, test the clan that there was no difference in the rents. A report by the NCAA

Paired T Test at 0.1 Level of Significance

A consumer products testing group is evaluating two competing brands of tires, Brand 1 and Brand 2. Though the two brands have been comparable in the past, some technological advances were recently made in the Brand 1 manufacturing process, and the consumer group is testing to see if Brand 1 will outperform Brand 2. Tread wear c

5 steps to hypothesis testing

86 total students were asked: Do you feel sleep deprived? Mean # hours of sleep Yes (51 students) 5.94 No (35 students) 7.06 Ho: mean = 7 hours of sleep, no feeling of sleep deprivation Ha: mean = < 7 hours of sleep, feeling of sleep deprivation Ple

One sample Students t test

1. A sample of 64 observations is selected from a normal population. The sample mean is 215, and the sample deviation is 15. Conduct the following test of hypothesis using the .03 significance level. Ho: µ &#8805; 220 H1: µ<220 a. Is this a one or two tail test? b. What is the decision rule? c. What is the value of the

Determining Hypotheses

1. Mary claims to be able to hypnotically cause her clients to perform significantly higher on the SAT. The national mean is 1200 with a standard deviation of 100. Under strictly controlled testing, a random sample of 200 of her clients revealed a mean score of 1210. Does this data support her claim. Show all steps. 2. The