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Hypothesis Testing

Population Mean

A consumer agency has retained an independet testing firm to examine a television manufacturer's claim that its 25-inch console lmodel consumes just 110 watts of electricity. Based on a preliminary study, the population standard deviation has been estimated as 11.2 watts for these sets. In undertaking a larger study, and using

Statistics: Level of Significant Problems

The average length of a flight by regional airlines in the United States has been reported as 299 miles. If a simple random sample of 30 flights by regional airlines were to have x = 314.6 miles and s = 42.8 miles, would this tend to cast doubt on the reported average of 299 miles? Use a two-tail test and the 0.05 level of sig

Effects of TV viewing on reading scores

Dr. S wishes to measure the effect of TV viewing on reading scores in elementary school children. The data for the sample are shown here. Assume the population is normal. # hours TV/week (x): 4,5,8,12,20,16,20,22,22,25,30 Reading scores (y):805,810, 860,750,715,755,720,635,615,540,500 a.Construct a scatter plot using Mini

Applying statistics for smokers and nonsmokers

Dr. Z at the Clinic wishes to see whether the pulse rates of smokers are higher than the pulse rates of nonsmokers. Samples of 100 smokers and 100 nonsmokers are selected. The results are shown here. Can Dr. Z conclude, at alpha = 0.05, that the smokers have higher pulse rates than nonsmokers? Assume the samples come from a no

Creating Statistical analysis in SPSS and Interpreting Results

Introduction and Methods section: Impulse-Control disorder is a formal DSM IV disorder and is a core symptom that is found across an array of psycho-pathological conditions and consequently contributes to a large number of mental health problems in society. As cited in the Diagnostic and Statistical Manual of Mental Disorders

Planning Habits Survey/Null and alternative hypothesis

American Demographics reported the results of a survey on the planning habits of men and women. In response to the question. "What is your preferred method of planning and keeping track of meetings, appointments, and deadlines?, 56% of the men and 46% of the women answered "keep them in my head". A nationally represented sample

Hypothesis testing: chi square and z-stat. At the .05 level of significance, test the claim that at least half of all voters prefer the democratic candidate. Test the claim that the proportion with the lawn mowers is higher than 65%. Use a .01 significance level to test the claim that for men without college degrees in that town, incomes have a higher standard deviation when a random sample of 22 men resulted in incomes with a standard deviation of 925$

1. A poll of 1,068 Americans reveals that 48% of the voters surveyed prefer the Democratic candidate for president. At the .05 level of significance, test the claim that at least half of all voters prefer the democratic candidate. 2. A nationwide study of American homeowners revealed that 65% have one or more lawn mowers. A l

9 Introductory Statistic Problems

I need help with these nine stat. questions. They come in two labs. Lab 6 and 7 and you need to use the data in the excel. I need to use the top half of the lab to answer the questions for the bottom half of the lab. Thank You ------------------------------------------------------------------------ The goal of this l

At the banks: Single waiting line versus Multiple waiting lines

The listed values are waiting times (in minutes) of customers. Bank A (Single waiting line) 6.5, 6.6, 6.7, 6.8, 7.1, 7.3, 7.4, 7.7, 7.7, 7.7 Mean=7.15 Bank B (Multiple waiting lines) 4.2, 5.4, 5.8, 6.2, 6.7, 7.7, 7.7, 8.5, 9.3, 10.0 Mean=7.15 Questions: 1). Bank A customer will receive service within how many min

Simple Analysis using Minitab

I need the analysis in Minitab and the same analysis in MS WORD, I do not have minitab on my comp here that is why I am having a problem. So give everything in word too. I will see the minitab file once i go to school. A data shows how many hours of south park do fisheries and wildlife student watch per week and then further

T-test: earnings per share for major companies

StreetInsider.com reported 2002 earnings per share data for a sample of major companies (Feb. 12, 2003) Prior to 2002, financial analysts predicted the 2002 earnings per share for these same companies (Barron's Sep. 10, 2001) Use the following data to comment on differences between actual and estimated earnings per share. C

Bob's Candies Case Study

Bob's Candies Bob loves making candy, especially varieties of caramel, including plain, chocolate dipped caramels and chocolate dipped caramels with pecans. Bob has received lots of compliments from his friends and neighbors, and several have encouraged him to start his own candy making business. After several days of res

Movie cost claim

Using a significance level of 0.05 I want to conduct 3 hypothesis tests using the data below. I need to state my alternative and null hypotheses and test a claim about a proportion. I would like my claim to be that over 50% of movies made cost over 1 million dollars to make. If that is not a good claim to use in order to give

Stem and leaf plot and Hypothesis testing

Here is what I need help with. You can use any of the below information to get the answers. Please use the first set of results for the first one though. I am in the military and I took a granade launcher and launched 30 rounds at a target and then measured how far from the target I was. Just so that you understand it is

Fuel Economy Cars, Lunch Break Times, Cable Strength, etc.

1.Define the term "hypothesis"; what is a hypothesis test? 2. List and describe two types of error that can occur in hypothesis testing. 3. An independent testing laboratory has been commissioned to determine the relative fuel economy of cars, light trucks, and sport utility vehicles. A random sample of 200 within each cat

Hypothesis Testing: Introductory College Economics

Sixty-four students in an introductory college economics class were asked how many credits they had earned in college, and how certain they were about their choice of major. Research question: At α = .01, is the degree of certainty independent of credits earned? Credits Earned Very Uncertain Somewhat Certain Very Certain

Savings On Textbook Using Amazon.com

Can students save money by buying their textbooks at Amazon.com? To investigate this possibility, a random sample of 15 textbooks used during the Spring 2007 semester at Iowa State was selected. The prices for these textbooks at both Iowa State bookstore and through Amazon.com were recorded. The prices for the textbooks, inclu

Supermarket Display Effect on Sales

Does the type of display used in a supermarket affect the sales of products? As the regional sales manager for Aldi's Foods, you are interested in comparing the sales volume of Aldi's cola when the soft drink is displayed in the normal shelf location as compared to an end aisle promotional display. to test the effectiveness of t

Single-Family Home Appraisals In Two Communities

A real estate agency wants to estimate the difference in the appraised values of single-family homes in two communities. A sample of 60 listings in Strongsville and 99 listings in Brunswick yields the following results (in thousands of dollars). Strongsville, Ohio: sample mean (1)= 191.33 Brunswick, Ohio: sample mean (2)=

Determine is males who quit exercising gain weight

A study was performed to determine if males who quit exercising gain weight. Eight male adults were weighed before they stopped exercising. They were weighed five weeks after they stopped exercising. Is there sufficient evidence at alpha = 0.05 that the males who quit exercising gain weight? Subject 1 2 3 4 5

Construct hypothesis tests in Excel for employee's

Use alpha = 0.05 unless specified otherwise. For each hypothesis test state HA (the research hypothesis) and H0 (the null hypothesis) using the proper symbols. (You can type mu or sigma for the corresponding symbols.) Include a "summary statement" for each hypothesis test. A formal Summary Statement is REQUIRED as part of al

Steel Cable Breaking Strength Statistical Analysis

Use alpha = 0.05 unless specified otherwise. For each hypothesis test state HA (the research hypothesis) and H0 (the null hypothesis) using the proper symbols. (You can type mu or sigma for the corresponding symbols.) Include a "summary statement" for each hypothesis test. A formal Summary Statement is REQUIRED as part of al

Inferential Statistics for different techniques of relaxation

The solution addresses: Three different relaxation techniques are given to randomly selected patients in an effort to reduce their stress levels. A special instrument has been designed to measure the percentage of stress reduction in each person. The data is shown below. You can assume normality and that good randomization an

Independent Samples hypothesis test for Effects of Alcohol

Confidence Interval for Effects of Alcohol: An experiment was conducted to test the effects of alcohol. The errors were recorded in a test of visual and motor skills for a treatment group of people who drank ethanol and another group given a placebo. The results are shown in the accompanying table (based on data from "Effects of

Inferences from two samples: a hypothesis test

In a study of women and heart disease, the following sample results were obtained: Among 10,239 women with a low level of physical activity (less than 200 kcal/wk), there were 101 cases of heart disease. Among 9877 women with physical activity measured between 200 and 600 kcal/wk, there were 56 cases of heart disease (based on d

Hypothesis testing, ANOVA, statistics and probability

Please see attachment for fully formatted question. 10.30 Note: For tests on two proportions, two means, or two variances it is a good idea to check your work by using MINITAB, MegaStat, or the LearningStats two-sample calculators in Unit 10. In Dallas, some fire trucks were painted yellow (instead of red) to heighten the

Hypothesis test: Difference in proportions problem

A sample of high school seniors showed that 18 of 60 who owned PlayStation 3 spent more than an hour a day playing games, compared with 32 of 80 who owned Xbox 360. Is there a significant difference in the population proportions at alpha = .10?

Hypothesis testing standard deviation with one sample. Minitab

Hypothesis testing with one sample Testing a Claim About a Standard Deviation or Variance Systolic Blood Pressure for Women: Systolic blood pressure results from contraction of the heart. Based on past results from the National Health Survey, it is claimed that women have systolic blood pressures with a mean and standard de

Tests of means and proportions and Tests of variances

Assignment for EText TESTS OF MEANS AND PROPORTIONS 9.52 At Ajax Spring Water, a half-liter bottle of soft drink is supposed to contain a mean of 520 ml. The filling process follows a normal distribution with a known process standard deviation of 4 ml. (a) Which sampling distribution would you use if random samples of 10 bot