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Hypothesis Testing

Comparing Two Treatments

A study of postoperative pain relief is conducted to determine if drug A has a significantly longer duration of pain relief than drug B. Observations of the hours of pain relief are recorded for 55 patients given drug A and 58 patients given drug B. The summary statistics are

Chi squared critical value

Find the critical value Chi squared R corresponding to a sample size of 3 and a confidence level of 95 percent.

Finding a z-score

Find the critical value za/2 which corresponds to a degree of confidence of 98%.

Business Research and Hypothesis Testing

1. What value is business research and hypothesis testing to a company? Start by defining business research and the steps in hypothesis testing. Then explain the value of business research and hypothesis testing using your organization as an example. 2. What is the "perfect" standard normal distribution? Explain your answer

Multivariance analysis question

A citrus company is interested in evaluating the performance of two orange juice extractors, A and B. It is believed that both the size and the variety of the fruit yield in the test may influence the yields (percentage juice by weight) obtained from the extractor. Two verities of oranges, Valencia and Navel, in large and smal

Writing a Hypothesis summary on given scenario

300 word hypothesis summary on The feasibility of hiring more employees when production increases instead of offering overtime pay to existing employees. This is not an assignmrnt i'm trying to understand how do I do an hypothesis on summary.

Test of Hypothesis

The file attached will you give a strong understanding in testing the hypothesis. Particularly the questions are based on comparing the mean, comparing proportion and regression.

Hypothesis testing samples

What is a test of a proportion and give an example. What test do you use when one sample is small and the other large? Explain the difference between testing one sample with a parameter and testing two samples. What are the likes and differences between the ttable and the z table? When would you use a two pop

Problem set

Hypothesis Test for Effects of Marijuana Use on College Student: In a study of the effects of marijuana use , light and heavy users of marijuana in college were tested for memory recall with the results given below. Use a 0.05 significance level to test the claim that the population of heavy marijuana users has a standard deviat

Testing of Hypothesis

Question One. Data from the National Youth Survey on the number of assaults on students appears to indicate some gender differences. State the null and alternate hypotheses to test this theory, choose the appropriate test statistic and variance estimator and justify their choice, determine the critical value for the test statist

Statistics Word Problem

Questions 1- 10 refer to the following: The average weight of newborn infants at a hospital is 6.6 pounds. A sample of seven infants is randomly selected and their weights at birth are recorded as 9.0, 7.3, 6.0,8.8.,6.8, 8.4, and 6.6 pound. 1. What is the null hypothesis? Ho: The average weight of a baby is 6.6 2. What

Hypothesis testing: one way anova

In exercise 6 use the listed sample data from car crash experiments conducted b the National Transportation Safety Administration. New cars were purchased and crashed into a fixed barrier at 35 mi/hr. and the listed measurements were recorded for the dummy in the driver's seat. The subcompact cars are the Ford Escort, Honda Civ

The Rocky Mountain district sales manager of JCM, Inc.,

The Rocky Mountain district sales manager of JCM, Inc., a college book publishing company, claims that each of his sales representatives makes 40 calls on professors per week. Several reps said that this estimate is too low. To research the claim, a random sample of 28 reps revealed that the mean number of calls made last week w

Hypothesis testing

1. A social scientist claims that, on average, adults watch less than 26 hours of television per week. Data are collected on the television-viewing habits of 25 randomly selected individuals. This sample indicates that the mean number of hours per week of watching television for an individual is 22.4 hours. a) formulate a sui

Create two hypothesis and test them for given data

I basically created a theory that automated enterprise information systems would save man hours etc... I then collected data to support this in the 10 questions. Now I need to create a couple of hypothesis to support the findings... IE. IF the questions answered show that the workers support having an automated enterprise

To test the null hypothesis using 5 steps

You are the member of the marketing team at Sara Bellum's Pizza - the pizza for people who think too much!! Your mission is to evaluate two locations and determine if there is any difference in their suitability as locations for the next Sara Bellum Pizza restaurant. You will use a level of significance of 0.05. The loca

Sample Survey Design

8. A telephone survey utilized a sampling frame of 2000 numbers, and had a response rate of 25%. A question asked respondents if they preferred Brand 1, Brand 2, or Brand 3. According to the company, 35% of their customers preferred Brand 1, 35% preferred Brand 2, and 30% preferred Brand 3. The telephone survey found that 40%

Idle Work Hours & Baseball Data

1. The idle times during the eight-hour day shift and the night shift are to be compared. A time study revealed the following numbers of minutes of idle time for eight-hour periods. Day shift: 92, 103, 116, 81, 89 Night shift: 96, 114, 80, 82, 88, 91 Is there a difference in the idle time between the two shifts? T


Question 44: (2 points) A nurse measured the blood pressure of each person who visited her clinic. Following is a relative-frequency histogram for the systolic blood pressure readings for those people aged between 25 and 40. Use the histogram to answer the question. The blood pressure readings were given to the nearest whole n

The solution to Test of mean

1. A sample of 45 overweight men participated in an exercise program. At the conclusion of the program 32 had lost weight. At the .05 significance level, can we conclude the program is effective? a. State the null hypothesis and the alternate hypothesis. b. State the decision rule. c. Compute the value of the test statisti

Do we reject the null hypothesis?

What would be the conclusions from the ANOVA analysis below regarding the null hypothesis? Do we reject the null hypothesis? (see data in the attached file)

Mean Testing

The average height of a particular plant is known to be 78 cms. The average height of 20 plants to which a particular manure was applied was found to be 85 cms. Assuming the heights are distributed normally with standard deviation 10. Examine whether the average height as increased by applying manure

Size and power of the test

If X1,X2,...,Xn is a random sample of size n from a Bernoulli population with parameter p such that P(X=1)=1-P(X=0)=p. Then to test Ho: p=po, if the critical region is taken as X1+X2+...+Xn<=n-2. Find the size of the test and obtain an expression for power function.

Statistics: Hypothesis testing

An industry safety program was recently instituted in the pharmaceutical industry. The weekly average losses (averaged over 1 month) in man-hours due to accidents in 10 similar plants before and after the program are as follows: PLANT BEFORE AFTER 1 30.5 23.0 2 18.5 21.0 3 24.5 22.0 4 32.0 28.5 5 16.0 14.5 6 15.0 15.5

To test if there is significant difference in mean funds.

These are word problems concerning hypothesis theory. --- A financial planner wants to compare the yield of income- and growth-oriented mutual funds. Fifty thousand dollars is invested in each of a sample of 35 income-oriented and 40 growth-oriented funds. The mean increase for a two-year period for the income funds is 1100 w