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Hypothesis Testing

Hypothesis Testing

A Federal funding program is available to low income neighborhoods. To qualify for the funding a neighborhood must have a mean household income of less then $15,000 per year. Neighborhoods with mean household income of $15,000 or more do not qualify. Funding decisions are based on a sample of residents in the neighborhood. A hyp

Hypothesis Testing

A well known doctor hypothesized that 75% of women wear shoes that are too small. A study of 356 women by the American Orthopedic Foot and Ankle Society found 313 women wore shoes that were at least one size too small. Test Null Hypothesis (Ho): p=.75 and alternative hypothesis (Ha): p does not = .75 at .01 level of significanc

Hypothesis Testing

Background:The Waterhole bar & grill decided to run a special offer of a free fried zucchini appetizer with the purchase of a pitcher of beer & a sandwich for Monday nights only during the height of the baseball season. A loyal customer who loves baseball and grows vegetables agreed to supply the squash free. Management's object

Test Value

A pizza store chain wants to see which pizza toppings customers seem t olike the best. A random sample of people were asked about their pizza preferences. At an alpha value of 0.01, find the test value for the data provided in the following table. Toppings pepperoni sausage mushroom onion No. sold 12

Identification of Parametric and Nonparametic Data

Please help me identify if each of the following situations "P" if it is an example of parametric data or "NP" if it is an example of nonparametric data. 1. In a comparison of two towns, is the average height of its residents the same? _____ 2. A manufacturer produces a batch of memory chips (RAM) and measures the mean-time-

Hypothesis Testing

The Problem Solving Inventory (PSI) has a normal distribution with mean = 90 and standard deviation = 15. A researcher suspects that the mean for female students is higher than 90. She takes an SRS of 25 female students and gives PSI. Suppose we know that scores in the population of female students are normally distributed with

Test Statistic

Data, test statistic, word problem. Please see the attachment.

Hypothesis Testing

Research by the Illinois Banking Company revealed that only 10 percent of their customers wait more than five minutes to do their banking. Management considers this reasonable and will not add more tellers unless the proportion becomes larger than 10 percent. The branch manager at the Litchfield Branch believes that the wait i

Significance level and hypothesis testing

Last year, television station WXYZ's share of the 10 P.M. news audience was approximately equal to, but not greater than, 25%. The station's management believes (and would like to claim for advertising purposes) that the current share is higher than last year's 25% share. In an attempt to substantiate this claim, the station s

Hypotheses Testing

A company that depends heavily on advertising for selling its products wants to know if its various advertising media have different effectiveness relative to the age of the customer. The company uses its warranty return cards to collect the following information: This is a table that lists type of advertisement first then it

Statistic problem: Hypothesis Testing of running shoes

Directions: Test the following hypotheses using the Traditional Method. You must show all the steps involved and the final statement must be phrased appropriately for the problem. A sports-shoe manufacturer claims that joggers who wear its brand of shoe will jog faster than those who don't. A sample of eight joggers is take

Hypothesis Testing

A statistician claims that the average score on a standardized test of students who major in psychology is greater than the average of students who major in mathematics. The results of the test, given to 50 students in each group, are shown below. Is there enough evidence to support the statistician's claim at a 1% level of si

Test of hypotheses: At a level of significance of 2%, is there enough evidence to say the percentage has changed? At a level of significance of 1%, can the claim be rejected? At a level of significance of 5%, is there enough evidence to support the manager's claim?

1. From past records, a hospital found that 37% of all full-term babies born in the hospital weighed more than 7 pounds 2 ounces. This year a sample of 100 babies showed that 23 weighed over 7 pounds 2 ounces. At a level of significance of 2%, is there enough evidence to say the percentage has changed? 2. A recent study s

Probability distribution and hypothesis testing

There are 4 entrances to a building in Philadelphia. The bldg maintenance super would like to know if the entrances are equally utilized. To investigate, 400 people were observed entering the building. The number using each entrance is reported below. At the .01 signficance level, is there a difference in the use of the four ent

Null and Alternative Hypothesis

Multiple Choice: All of the following are possible hypotheses surrounding nominal data except: a. The percentage of people favoring brand A is greater than the percentage favoring brand B. b. The average income of electricians exceeds the average income of carpenters. c. The number of households with term life insurance e

Null and Alternative Hypothesis

Given a two-tail test for the population mean, the null hypothesis contains a(n) __________ sign, and the alternative hypothesis contains a(n) ___________ sign. a. ¹, = b. =, ³ c. £, = d. =, ¹ Use the following information for questions 3 - 5. The Waterhole bar and grill decided to run a special offer of a fr

2 True and False questions on hypothesis testing

1) For any hypothesis test, if the value of a parameter being tested falls outside the confidence interval for the same level of a, the correct decision is to reject the null hypothesis. Is this True or False? 2) Irrespective of whether a two-tail or one-tail test is being conducted in order to compare two population means, t

Null and Alternative Hypothesis

The educational testing service (ETS) designs and administers the SAT exams. Recently the format of the exam changed and the claim has been made that the new exam can be completed in an average time of 120 minutes. A sample of 50 new exam times yielded an average time of 115 min. The standard deviation is assumed to be 2 minu

Statistics help: Null and Alternative Hypotheses

In an attempt to improve quality many manufacturers are developing partnerships with their suppliers. A local fast food burger outfit has partnered with its supplier of potatoes. The burger outfit buys potatoes in bags that weigh 20 lbs. It does not wish to accept underweight bags of potatoes. A sample of 40 bags shows an ave

Null and Alternative Hypothesis

10.21 An automobile company thinks that with new designs, it scars will last longer before having a problem. For this reason the company wishes to extend the warranty that comes with the vehicle in hopes of attracting more customers. Before making this change the idea is tested. Prior to the design changes, the cars lasted on th

Null and Alternative Hypothesis

A vending machine that dispenses coffee into cups must fill the cups with 7.8oz of liquid. Before selling the vending machine to a college or business, the company tests the machine to be sure it is dispensing an average amount of 7.8oz of coffee. A sample of 20 amounts is shown below. The amount of coffee dispensed is assumed

Statistic problem

Test the hypothesis that there is no difference in the age of the death for the United States Presidents and Vice Presidents. (see attachment for full question)

Hypothesis Tests

Problems are attached in word format. The questions are posted below to provide quicker review. Thanks, Q1) Does gender impact the use of electronic mail (e-mail)? An insurance company studied the use of e-mail in its organization by counting the number of business-related e-mails generated by 10 men and 10 women matched o

Statistic Problem

The New York Stock Exchange (NYSE) consists of listing of approximately 1,500 companies, which offer shares of company stock to the public. Stockbrokers are interested not only in the individual stocks, but also in general trends established by the market as a whole. They often base inferences upon the daily closing prices of

Hypothesis Testing , Normal Distribution

1) Hypothesis Testing A. For the statement: The mean amount of Pepsi in cans is at least 12 oz. Express the null hypothesis and the alternative hypothesis in symbolic form. B. Find the z value for the following : The claim is u(mu) =12, and the sample statistics include n =36, xbar = 12.19 and s = .11 C. Determine whether

Hypothesis Testing

5. In the past it took Kim 148.4 seconds to swim 200 meters. Kim wants to know if her average has changed. She records her time on 50 randomly selected occasions and computes the mean to be 147.8 seconds with a standard deviation of 2.3 seconds. a. Perform the appropriate test of hypothesis to determine whether Kim's average t