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For a particular sample of 56 scores on a psychology exam, the following results were obtained.
First quartile = 67 Third quartile = 91 Standard deviation = 9 Range = 48Mean = 75 Median = 80 Mode = 81 Midrange = 74
Answer each of the following:
I. What score was earned by more students than any other score? Why?II. What was the highest score earned on the exam?III. What was the lowest score earned on the exam?IV. According to Chebyshev's Theorem, how many students scored between 57 and 93?V. Assume that the distribution is normal. Based on the Empirical Rule, how many students scored between 57 and 93?
Credit card companies use a scoring model to determine the credit worthiness of a prospective card holder. Factors such as income, employment, home ownership, and credit history determine one's score.
Identify and justify which type of sampling (random, stratified, systematic, cluster, convenience) is used in the following examples.
The critical values are values of the test statistics that separate the rejection region from the non rejection region. Is this true? Explain answer.
What would be the correct null and alternative hypothesis for the following situation: The sample has a mean of 72.3 mph and a standard deviation of 7.4 mph. Use a 0.05 significance level to test the claim that the mean speed of all cars is greate..
Use MegaStat's output for simple linear regression to determine the regression equation
To cross a single lane of moving traffic, we require at least a duration d. Successive car interarrival times are independently and identically distributed with probability density function fT (t).
ample of fifteen 8 ounce Baby Ruth candy bars are weighed and it is found sample standard deviation is 0.6 ounces. Test company's claim at (alpha sign) is 0.05.
Formulate the hypotheses to test to see if the mean of the population is at least 12 ounces.
What is the null hypothesis? Use α =0.05. Compute critical value. Use α =0.05.
From her district, consisting of several hundred stores, she selects a random sample of 30 stores. For each store she gathered the following information.
Find out equation of the line of best fit. Find out r - Is there a strong relationship?
At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
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