Stats Help for College-level Students

Test the Claim

A test of statistical reasoning is given to 10 students before and after an elementary statistics course. At V = 0.05, test the claim that the mean score is not affected by the course. Assume the students are randomly selected from normally distributed populations. BEFORE: 74 83 75 88 84 63 93 84 91 77 AFTER: ...continues

Test the Claim

7 of 8,500 people vaccinated against a disease, later developed the disease. 18 out of 10,000 people after being vaccinated with a placebo(false vaccination), later developed the disease. Test the claim the vaccination helps lower the disease rate. Use a Type I error of 0.02. Please show all steps and use traditional metho ...continues

Confidence Interval

Using the following information, construct a 90% confidence interval for (:1 - :2). Sample 1: n = 8 mean = 151 standard deviation = 31 Sample 2: n=21 mean = 130 standard deviation = 72 please show results of all steps in the process.

Testing the claim.

A random sample of 15 women yielded a mean pulse rate of 74.5 beats/minute with a standard deviation of 9.6. A random sample of 12 men yielded a mean pulse rate of 76.0 beats/minute with a standard deviation of 8.7. Test the claim that pulse rates for men and women are the same. Use V = 0.01. Use the traditional methods fo ...continues

Determining the minimum sample size using a confidence level and a margin of error.

A survey of shoppers is planned to determine what percentage use credit cards. Prior surveys suggest that 59% use credit cards. The required margin of error is 0.02 at 95% confidence. What is the minimum sample size required to assure that your sample proportion "p" will be within the required margin of error around the popul ...continues

TEST THE CLAIM

A random sample of 15 women yielded a mean pulse rate of 74.5 beats per minute, with a standard deviation of 9.6. A random sample of 12 men yielded a mean pulse rate of 76.0 beats per minute, with a standard deviation of 8.7. Test the claim that pulse rates for men and women are the same. Use a=.01.

A cereal company claims that the weight of the cereal in one of the packages is at least 14 ounces.

A cereal company claims that the weight of the cereal in one of the packages is at least 14 ounces. Eight packages are tested and the weights given below are measured. Test the claim at a=.0.01 14.6, 13.8, 14.1, 13.7, 14.0, 14.4, 13.6, 14.2 I have my null hypothesis as M (greater than or equal to) 14.0, and alternative hy ...continues

A common problem in inferential statistics is constructing a confidence interval.

The makers of a soft drink want to identify the average age of its consumers. A sample of 16 consumers is taken. The average age in the sample was 22.5 years with a standard deviation of 5 years. 1. Construct a 95% confidence level. 2. Now do the same thing with 80% confidence level.

Testing the null hypothesis using a single-sample test

A cereal company claims that the average weight of its cereal packages is 14 ounces. Eight packages are tested and the weights given below are measured. Test the claim at α=.0.01 14.6, 13.8, 14.1, 13.7, 14.0, 14.4, 13.6, 14.2

Determining the percentage from a sample using margin of error and a confidence level.

A survey of shoppers is planned to determine what percentage use credit cards. The required margin of error is 0.02 at 95% confidence. What is the minimum sample size required to assure that your sample proportion "p" will be within the required margin of error around the population "p".