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Hypothesis Testing

Hypothesis Testing the Effect of VS on Grades

1. You are interested in the effect of how the age of students VS affects their grades in college. To test the effect you setup a study to analyze the affect that a student's age has on their grades in college. You divide the students into groups and record their overall GPA in college. The results follow: Source of Variatio

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

Null Hypothesis of Banks Catering to Clientele

The manager of a local branch of a bank believes that over the past few years the bank has begun to cater to a different clientele and that the average amount withdrawn from its ATMs is no longer $140.00. State the null hypothesis Ho and the alternative hypothesis H1.

Statistics - Hypothesis Testing and ANOVA

The following data represent samples of size 45 which were drawn randomly from the graduating classes of three competing high schools ... Construct a 98% confidence interval for the population mean SAT of the of students from High School 1. Test the appropriate hypothesis to examine if High Schools 1 and

Hypothesis Test: Population Mean

Suppose that 9 observations are drawn from a normal population whose standard deviation is 2. The observations are: 15, 9, 13, 11, 8, 12, 11, 7, and 10. At 95% confidence, you want to determine whether the mean of the population from which this sample was taken is significantly different from 10. Compute the value of the tes

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

Level of Significance for Z and T Tests

The solution addresses the following. A new weight-watching company advertises that those who join will lose, on average, 10 lbs. the first two weeks. A random sample of 50 people who joined revealed the mean loss to be 9 lbs. with a standard deviation of 2.8 lbs. At the .05 level of significance, can we conclude that those

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

Relating level of confidence to margin of error

5. A recent survey of 800 TV viewers found 44% watched NBC news. The margin of error was reported as 3.4%. Using a 95% level of confidence, show how this margin of error was obtained. , list =?, p=?,q=?,n=?, SE=?

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

Hypothesis Testing: Female Blood Pressure

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 deviation of 130.7 and 23.4, respective

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

Significance of the Difference Between Two Sample Means

I need help with this problem. I already know the answer. I am confused between the lectures, textbook, and work text. Can you show me, the old fashioned way (not Excel, SPSS or any other software to generate the answer), I need the formulas to show how to come up with the correct answer? Here is the problem: An experim

Auditor review

An auditor reviewed 25 oral surgery insurance claims from a particular surgical office, determining that the mean out-of-pocket patient billing above the reimbursed amount was $275.66 with a standard deviation of $78.11. (a) At the 5 percent level of significance, does this sample prove a violation of the guideline that the aver

Hypothesis Testing

The Web-based company Oh Baby! Gifts has a goal of processing 95 percent of its orders on the same day they are received. If 485 out of the next 500 orders are processed on the same day, would this prove that they are exceeding their goal, using α = .025?

Coin flip ...

A coin was flipped 60 times and came up heads 38 times. (a) At the .10 level of significance, is the coin biased toward heads? Show your decision rule and calculations. (b) Calculate a p-value and interpret it.

Graduate Program Applicants: Nondirectional Test

Over a 20 year period, the average grade point average of applicants to our graduate program has been found to be 3.27. This year the mean grade point average of the 57 students applying to our graduate program is 3.53, with a standard deviation of 0.29. Test the hypothesis that the current sample came from a population in whi

Determining Significance: Chronic Fatigue Syndrome Treatment

Treating Chronic Fatigue Syndrome Patients with chronic fatigue syndrome were tested, then retested after being treated with fluorocortisone. Listed below are the changes in fatigue after the treatment (based on data from "The Relationship Between Neurally Mediated Hypertension and the Chronic Fatigue Syndrome" by Boi Holaigah,

Scatter plot, correlation coefficient, and a hypothesis test

(a) Make a scatter plot of the data. What does it suggest about the correlation between X and Y? (b) Use Megastat or Excel to calculate the correlation coefficient. (c) Use Excel to find t.05 for a two-tailed test. (d) Calculate the t test statistic (e) Calculate critical value of ra. (f) Can you reject p=0? Orders(X)

Hypothesis test for a sample mean

The mean wages paid to Americans between the ages of 45 and 64 across all demographics in the United States is $38,740 with a standard deviation of $156. We took a sample of 31 workers between the ages of 45 and 64. They had a mean earned wages of $33,298. At the 0.05 significance level can we conclude does the sample show that

Relationship between levels of significance and rejecting the null

1-The lower the level of significance, the harder it is to reject the null. In sum, you want to be REALLY sure that your alternative hypothesis is correct, so if you use a low significance level (say, .01), then you would only reject the null if you're REALLY sure about the outcome. Most use a .05 level of significance, which

Hypothesis Testing for prospective cohort study

A recent prospective cohort study analyzed the effect of calcium plus vitamin D supplement use on the development of osteoporosis (weak and brittle bones). QUESTION 11 What are the null and alternative hypotheses being investigated in this study? (Be sure to specify the exposure-outcome association under study along with t

Stock Market: Hypothesis Test for Equal Population Variance

Each day the major stock markets have a group of leading gainers in price (stocks that go up the most). On one day the standard deviation in the percent change for a sample of 10 NASDAQ leading gainers was 15.8. On the same day, the standard deviation in the percent change for a sample of 10 NYSE leading gainers was 7.9 (USA Tod

Hypothesis test: population proportion

CherryBerry Soda, Inc. claims that 15 percent of the population can identify its products. In efforts to boost their identity, CherryBerry employs a famous spokesperson to advertise. A survey is then taken to assess the results of the ad campaign. The results show that 17 percent of the 1000 respondents can identify CherryBerry