Stats Help for College-level Students

7 multiple choice questions on normal distribution, confidence interval, critical values, F test, statistical significance, linear regression

1. Only two doctors would make a diagnosis on patients coming into the same STD clinic for gonorrhea. The probability of the two doctors making a diagnosis of gonorrhea is (independent, dependent, synergistic, cannot tell). 2. Assume that birth weights are normally distributed with a mean of 3400g and a standard deviation of ...continues

Statistics/Phstat - Complete a decision tree and opportunity loss table

Purchase Price= 10 Selling price = 20 on Christmas day 2 otherwise Profit/loss 10 on Christmas day (8) otherwise a) Compute the payoffs for purchasing 100,200,500 or 1000 trees for each level of demand b) Set off the payoff table indicating the event and alternative course of action c) Set up a decisi ...continues

Test whether the sample has been drawn from the population.

A Variable has a mean of 100 and a standard deviation of 16. Four observations of this variable have a mean of 108 and a sample standard deviation of 12. Test whether the sample has been drawn from the population. a. Standardized version of x (sample mean). b. Studentized version of x (sample mean).

Hypothesis Testing: Compute the statistical z test and deciding what to do with the null.

In a recent national survey, the mean weekly allowance for a nine-year-old child from his/her parents was reported to be $3.65. A random sample of 45 nine-year-olds in northwestern Ohio revealed the mean allowance to be $3.69 with a standard deviation of 0.24. At the 0.05 level of significance is there a difference in the mean a ...continues

Hypothesis Testing: Compute the statistical test using the t test and decide what to do with the null.

One of the Rocky Mountain School District Principal's claims that each of his assistant principals makes 40 calls on parents per week. Several other Principals said that this estimate is too low and that their assistant principals make even more calls. To research the claim, a random sample of 28 assistants revealed that mean ...continues

finding expected value in 2x2 table

Myocardial Infarction Status Yes No OC User 683 2537 Non-OC user 1498 8747 The question is what the expected value for an OC user and no myocardial infarction? I found all kinds of things to calculate in 2x2 tables, but not this. Probably am overlooking something simple.

Question on expected values

Given the following 2x2 table: Myocardial Infarction Status Yes No OC User 683 2537 Non-OC user 1498 8747 Calculate the expected value for an OC user and no myocardial infarction. The TA said "2537", which may be correct, but I think some kind of chi-square goodness of fit or a similar test is needed to se ...continues

Neyman-Pearson Significance Testing: Critical Regions

What I'm looking at immediately is "Using the .05 cutoff figure, find an appropriate critical region for testing the null hypothesis 'theta is greater than or equal to .154 against the alternate hypothesis 'theta is less than .154' and provide a Neyman-Pearson analysis.". Background facts for the problem: In the county, 1 ...continues

Preparing forlicensing exam and need study guide, tutoring, with probability & statistics

Need simplyfied lessons in statistics and probability.

Hypothesis Testing - Test the hypothesis that the annual income of teachers in areas of more than 500,000 is significantly more than those in areas of less than 100,000. Use the 5% level of risk.

A study was conducted on the annual incomes of public school teachers in the state of x, in metropolitan area of less than 100,000, and in metropolitan areas having a population of over 500,000. Some sample statistics are: The group has the following characteristics: Less than 100K Population 45 Mean $31,290 Standard Devi ...continues