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Assume that the mean score on a normally distributed statistics quiz taken by 400 psychology students was 76, and the standard deviation was 8. Ben had a z-score of -1.2.
If someone gave a passing grade only to the top 25% of the class, what is the lowest score that would be considered passing?
What scores cutoff the middle 40% of grades?
Lowest grade:
Highest grade:
What proportion of students scored outside of the area between scores 66 and 86?
Comment on each of the following as a potential sample survey question. Is the question clear? Is it slanted toward a desired response?
In her wallet, Susan has 12 bills. 6 are $1 bills, 2 are $5 bills, 3 are $10 bills, and 1 is a $20 bill. She passes a volunteer seeking donations for the American Red Cross and decides to select 1 bill at random.
What is the probability that no more than one person will sign up? Draw a Venn diagram that includes the possible events and their relative frequencies for this situation.
What is the Total Price? This is what you would charge the customer so that you can have your profit markup of 20% over all of your costs.
Take civil strife as the dependent variable. Compute the zero-order correlations among the three variables.
Describe the sampling methods in your own words (paraphrase, do not quote from the article). Describe the generalizability or the transferability.
What is the test statistic for sample of size 21, mean 11.39, and standard deviation 1.53? Enter the test statistic with 2 decimal places.
What is the probability the average of four babies' weights will be within 0.6 pound of the mean; will be between 6.4 and 7.6 pounds?
Can we conclude that gender and cell phone provider are independent? If not, what implications does this have for marketing?
His sample size was 50,000. His method worked better than the Digest"s method. He predicted the correct winner, but was still off by 6 percentage points. How did he predict the Digest prediction so well?
find a 95% confidence interval for the total net amount won or lost from 1000 plays of the game. - Would you conclude that this strategy is a winning one for you?
For the leading health maintenance organization (HMO) firms,
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