### A Fictitious Statistical Study

Tuesday, 11 April 2017

For this activity you will undertake an analysis based on a self-designed fictitious study that utilizes statistical methodologies. You will first develop a fictitious problem to examine, it can be anything. For example, maybe you want to look at whether scores on a standardized college placement test (like the SAT) are related to the level

### Identify null hypothesis and alternative hypothesis

Tuesday, 11 April 2017

A skeptical paranormal researcher claims that the proportion of Americans that have seen a UFO is less than 1 in every one thousand. State the null hypothesis and the alternative hypothesis for a test of significance.

### Test Hypothesis for Population Proportions

Tuesday, 11 April 2017

Please help with the following problem. I need to test the hypothesis (? = 0.05) that the population proportions of red and brown are equal (pred = pbrown). You are testing if their proportions are equal to one another, NOT if they are equal to one another AND equal to 13%. NOTE: These are NOT

### a collection of statistics problems

Tuesday, 11 April 2017

1. A taxi company manager is trying to decide whether the use of radial tires instead of regular belted tires improves fuel economy. Twelve cars were equipped with radial tires and driven over a prescribed test course. Without changing drivers, the same cars were then equipped with regular belted tires and driven once again over

### Solving Hypothesis Testing Problems

Tuesday, 11 April 2017

1. Examine the given statement: The proportion of people aged 18-25 who currently use illicit drugs is equal to 0.20 (or 20%). Now, express the null hypothesis H0 and alternative hypothesis H1 in symbolic form. Be sure to use the correct symbols µ, p, and for the indicated parameter. 2. Refer to the following data:

### comparison for three methods

Tuesday, 11 April 2017

A student of the author surveyed her friends and found that among 20 males, 4 smoke and among 30 female friends, 6 smoke. Give two reasons why these results should not be used for a hypothesis test of the claim that the proportions of male smokers and female smokers are equal. Given a simple random

### hypothesis test with dependent t test

Tuesday, 11 April 2017

1. Refer to the sample data given below: The mean tar content of a simple random sample of 25 unfiltered king-size cigarettes is 21.1 mg, with a standard deviation of 3.2 mg. The mean tar content of a simple random sample of 25 filtered 100 mm cigarettes is 13.2 mg with a standard deviation of

### Testing Hypothesis Claim

Tuesday, 11 April 2017

A personal director in a particular state claims that the mean annual income is greater in one of the state’s counties (county A) than it is in another county (county B). In county A, a random sample 17 residents has a mean annual income of \$42,000 and a standard deviation of \$8500. In County B,

### This post addresses the rejection region, z-score & p-value.

Tuesday, 11 April 2017

I need some help with the following questions: How is the rejection region defined and how is that related to the z-score and the p value? When do you reject or fail to reject the null hypothesis? Why do you think statisticians are asked to complete hypothesis testing?

### Use NORMSINV(RAND()) to generate spreadsheet

Tuesday, 11 April 2017

Financial analysts often use the following model to characterize changes in stock prices: Pt = Po*e^(u-0.5s^2)t+s*Z*t^0.5 where Po = current stock price Pt – price at time t u – mean (logarithmic) change of the stock price per unit time s = (logarithmic) standard deviation of price change Z = standard normal random variable This

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