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A social psychologist recently developed a childhood memories test that is intended to measure how people recall pleasant and unpleasant memories from childhood. Scores on this test range from 1 (very unpleasant) to 100 (very pleasant). The psychologist standardized the test with a very large group of college students (ages 18-25), and the means score was μ = 60. The test was then given to a sample of N = 25 individuals who were all between the ages of 40 and 45. The average score for this sample was = 64.3 with s = 4.9. Does this sample provide sufficient evidence to conclude that childhood memories for older adults (ages 40-45) are significantly more pleasant than memories for college students? Use a one-tailed t-test with α = .05 (include all elements as detailed in t-Test Handout).
Each order has a fixed cost of $8 and the annual demand quantity is 150,000 units. What is the company's optimal order quantity?
can a test of significance show a statistically significant relationship while a measure of association shows a weak
Explain what type of data is displayed in contingency tables. Explain how contingency tables and their related statistics are used to test for significance of relations among the data.
The top 25 companies ranked by market capitalization operating in the washington DC, area along with the year they were founded and the number of employees are given below.
Assume each shot is independent of the others. If she shoots 6 arrows, what's the probability of each result described below. Her first bull's-eye comes on the third arrow.
Find a 95% confidence interval for the difference between the proportion of large customers who pay within 15 days and the similar proportion of medium-size customers.
if n7 and ? .35 what is the probability of the following?a. x6b. x ?5c. x less than 4d. x is greater than
In the 18th century, the Chevalier de Mere asked Blaise Pascal to compare the probabilities of two events. Below, you will compute the probability of the two events that, prior to contrary gambling experience, were thought by de Mere to be equally..
Calculate the approximate probability of rejecting the null hypothesis if the true mean return were equal to
Suppose that this is a simple random sample of adult residents of Maine.
calculate the z-test for sample 100 sample mean 3.4 population mean 3.67 and standard deviation of
In a recent year, business failures in the United States numbered 83,384, according to Dun & Bradstreet. The construction industry accounted for 10,867.
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