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Hypothesis Testing

Hypothesis Testing Focused on Significance Levels

Surveys have been widely used by politicians around the world as a way of monitoring the opinions of the electorate. Six months ago, a survey was undertaken to determine the degree of support for national party leader. Of a sample of 1,100, 56% indicated that they would vote for this politician. This month, another survey of 800

Developing a hypothesis about a mean time

Studies from a local mall show the typical shopper spends 0.75 hrs shopping. The standard deviation is 0.10 hours. A sample of 45 shoppers revealed the mean time spent increased to .080 hrs. Develop a hypothesis to determine if the mean time spent is more than 0.75 hrs using the .05 significance level. Suppose the mean sh

This is a Statistics Problem

1. An experiment is designed to test the effectiveness of a specific type of gender selection process, using 15 couples trying to have baby girls. Here is the question: The empirical rule applies to bell-shaped (normal) distributions. Is the binomial probability distribution for this experiment approximately normal? Show w

Various Statistical Analyses

1. Suppose a sample of size 25 is selected from an underlying normal population, the population standard deviation is known to be 8, and the sample mean is 57. Carry out a hypothesis test at the 0.05 level of significance, where the null hypothesis H0 is  = 60 and the alternative hypothesis H1 is   60.

Hypothesis Testing

A reasearcher wishes to determine whether people with high blood pressure can reduce their blood pressure by following a particular diet. Use the sample data below to test the claim that the treatment population mean is smaller than the control population. Treatment group n=90 sample average (x-bar)=168.1 sample standard d

Formulate and Test Hypotheses of product recognition

A marketing survey involves product recognition in New York and California. Of 600 New Yorkers surveyed, 195 knew the product while 150 out of 614 Californians knew the product. At the 0.05 level of significance, test the claim that the recognition rates are the same in both states. a. Formulate the hypotheses. b. Test the

General Mills Employees Satisfaction regression

See attached document. --- #1 A sample of General Mills employees was studied to determine their degree of satisfaction with their present life. A special index, called the index of satisfaction, was used to measure satisfaction. Six factors were studied, namely, age at the time of first marriage (X1), annual income (X

Variance & Linear Regression

Need help with examples attached. There is a comment in two cells that have a formula for hypotheses...I did not know how to place the digits directly above / under each other. --- #1 The following hypotheses are given: H0: σ21 = σ22 H1: σ21 ≠ σ22 A random sample of eight observatio

Formulate and Test Hypothesis

A medical school claims that more than 32% of its students plan to go into general practice. It is found that among a random sample of 130 students, 46 of them plan to go into general practice. a. Formulate the hypotheses to test the medical school's claim. b. Test these hypotheses and draw a conclusion about the claim. Us

Electricity consumption by single-family homes in two separate countries

A large public utility company wants to compare the consumption of electricity during the summer season for single-family houses in two counties that it services. For each household sampled, the monthly electric bill is recorded with the following results: (Note the italicized X below should have a line above it.) X $115


A sample of 12 homes sold last week in St. Paul, Minnesota, is selected. Can we conclude that as the size of the home (reported below in thousands of square feet) increases, the selling price (reported in $ thousands) also increases? Home Size Selling Home Size Selling (thousands Price (thousands of

Effect of birth control on exercise capacity

A physiologist wishes to study the effect of birth control pills on exercise capacity. Five female subjects who have never taken the pill have their maximal oxygen uptake measured during a treadmill session. The five subjects then take the pill for a specified length of time and their uptakes are measured again, as given below

Hypothesis testing with alpha level of 0.01

A supervisor and production specialist for a company wants to be sure that the 16 oz. can of worms it sells contains 16 ounces. The volume of the can doesn't allow for very much overfilling. A random sample of 49 cans of worms shows a sample mean of 15.1 ounces with a standard deviation of 0.2 ounces. Should production be stopp

Hypothesis testing to determine earnings in tips

At the time she was hired as a server, Beth was told, "you can average more than $20 a day in tips." Over the first 35 days she was employed at the restaurant, the mean daily amount of her tips was $24.85, with a standard deviation of $3.24. At the .01 significance level, can Beth conclude that she is earning an average of mor

Hypothesis Testing and Calculating Sample Size

Please complete the following: 1.What do you do with the employees who experience equal intrinsic and extrinsic job satisfaction. 2. What is the required sample size if you need to estimate the number of workers in the United States who are highly satisfied with their job and you want the estimate to be within 2 percentag

School of Public Health

Hypothesis testing and t-tests 1. A researcher randomly assigns subjects with hypertension to one of three drug doses, then measures the heart rate of each group after administering the drug. The purpose of the study is to see what effect the drug has on heart rates. What are the independent variable(s) and dependent variable

Calorie Watchers

Calorie Watchers has low-calorie breakfasts, lunches, and dinners. If you join the club, you receive two packages meals a day. CW claims that you can eat anything you want for the third meal and still lose at least five pounds the first month. Members of the club are weighed before commencing the program and again at the end of

Null and Alternative Hypothesis Analysis

The following hypotheses are given: Ho: Forty percent of the observations are in category A, 40 percent are in B, and 20 percent are in C H1: The observations are not as described in Ho We took a sample of 60, with the following results: Category Fo A 30 B 20 C

Hypothesis Testing

(The table is the student's t values generated by Minitab Version 9.2. Do not show sketches) --- Statistics Problems#1 Marketing: Shopping Time - How much customers buy is a direct result of how much time they spend in the store. A study of average shopping time in a large national house ware store gave the following info

How to write a research report using grounded theory

The topic I am treating now is based on using qualitative analysis based on grounded theory to investigate the topic "Mature student studying at University". Please could you shed some light on how to go about writing a report on this, especially on Abstract, introduction, Methods result/discussion section .

Statistics - Required sample size for the automotive industry

(See attached file for full problem description) --- 1. Use the below data to compute the sample size required for the Automotive Industry 2. Describe the independent and dependent variables 3. Include final recommendations related to defining and explaining the problem and stating the hypotheses that will be tested ---

Higher Taxes survey - Hypothesis Testing

Show all work. State H0 and H1 where appropriate. (Use a 95% confidence level unless another level is specified.) Answers must be with reasons Exhibit T1: According to a 1992 survey, a 40% of the American population would support higher taxes to pay for health insurance. A state government is considering offering a health i

Hypothesis test

A medical board approved the average stay in the hospital for patients that have a particular operation as 6.0 days. However, the insurance company the claims that the average hospital stay for patients has been substantially longer than 6.0 days. To examine this claim a sample of 100 patients who had this operation in the last

Hyopthesis testing and Z-Distribution

1. A new process has been implemented and it is stated to have an average cycle time of 120 seconds. A sample of 50 cycles yielded an average cycle time of 115 seconds, with a standard deviation of 2 seconds. A. Set up the null and alternative hypothesis B. Test your hypothesis using a level of significance of 0.05 A new proc


(See attached file for full problem description) --- Deb is the owner and manager of Deb's Specialty Coffees and Desserts, a small Oregon firm that roasts coffee beans and retails bulk beans to grocery stores, as well as desserts targeted to health conscious consumers. Deb is curious as to whether her new publicity campaign

Analysing Confidence Levels

As part of the quality control process, samples of parts are periodically taken for measurement to see if they conform to specifications. In one sample the diameter of a part is measured with the following results: x_m1 = 3.56 mm, σ_1 = 0.06 mm, n_1 = 20 A second sample is taken with the following results: x_m2 = 3

Rejection Rate Hypothesis

It is suspected that the rejection rate for a plastic-cup-molding machine is dependent on the temperature at which the cups are molded. A series of short tests is conducted to examine this hypothesis with the following results: Temperature Total Production Number Rejected T1 150