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1. What is pooled variance and why is it important?
2. Explain what interval data is and give an example:
3. Write the formula for a problem that has 2 sample populations greater than 30 and the standard deviations are known and equal:
4. Write the formula for pooled variance.
5. Please analyze the following data using the T-test for Unpaired data:
A school district wants to determine if the girls are equal to boys in test scores. They took a random sample of 22 8th grade girls and 24 8th grade boys. The district looked at recent CAT scores and found the mean score for girls to be xbar1 = 25 and the mean score for boys to be xbar2 = 26. The standard deviation for the girls is s1 = 2.2 and for the boys the standard deviation is s2 = 3.4. Is the school district correct in assuming the girls are equal in performance to boys. They are 95% sure their assumption is correct.
An investigator wishes to study the effect of cigarette smoking on the development of myocardial infarction (MI) in women. A sample of 2000 disease-free current smoking women and 100 disease-free ex-smoking women
Distinguish the various observational study designs and the randomized controlled trial with regard to validity and feasibility.
Is there a method which is accepted across industries for determining the minimum size of valid sample? N>50 +(8m aka 8 times the number of independent variables)
Determine the probability of having more than 3 defects in a roll?
Using an alpha of .05, what can you conclude about homogeneity of variance from the output? Word process your responses on the SPSS output pages.
How many students would be required to estimate the proportion of students who consume coffee? Suppose we want the estimate to be within 5% of the true proportion with 95% confidence.
Solve the equations using linear algebra
You are given the sample mean and the sample deviation, Use this information to construct the 90% and 95% confidence intervals for the population mean. Which interval is wider?
What is the probability a random sample of 75 students will provide a sample mean Sat score within 20 of the population mean?
The newspaper has charged that your police department responds more slowly to 911 calls in poor neighborhoods than in more wealthy ones.
The director of a radio broadcasting company wants to determine whether the mean length of commercials on his station is equal to 24 seconds.
Compute the standard error of estimate, and interpret its meaning.
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