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The Webster University librarian believes that more than 60% of the books checked out by students were fictional material. In a random sample of 1000 students who checked books out in the last year, 628 checked out fictional material. What can one conclude about the librarian's hypothesis at a level of significance of .05?
a) Direction = UPPER TAILED/LOWER TAILED /2-TAILED (circle one)
b) P-value = ________________
c) REJECT THE NULL or DO NOT REJECT THE NULL? (Circle one)
d) Can we conclude the librarian's claim is correct? YES or NO (circle one)
To test this notion, eight paid volunteers were placed (individually) in a room in which there was no light from the outside and no clocks or other indications of time.
The mean time to download an Google video is 1 minute 30 seconds. Suppose the download time is normally distributed with standard deviation of 20 seconds.
A sample of 160 workers in the downtown area classified each worker by race. A bar graph of the results is given below, but the bar for black workers in the graph below has been omitted.
What is the null and alternative hypothesis? What is your final conclusion?
Set up null hypothesis for associated F test.
The American Automobile Association checks the prices of gasoline before many holiday weekends.
University of Waterloo are much susceptible to hypnosis which University of Tennessee undergraduates. Set up H0 and Ha for the test.
An internal study by the Technology Services department at Lahey Electronics revealed company employees receive an average of two emails per hour. Suppose the arrival of these emails is approximated by the Poisson distribution.
Assuming that these are a random sample of all publicly traded companies, construct a 95 % confidence interval for the overall noncompliance proportion.
MATH1550H: Assignment: Question: what is the least number of applicants that should be interviewed so as to have at least 50% chance of finding one such secretary?
Choosing the appropriate the sampling design for the given data
Key Refining decided to send a special financing plan to charge account customers having the highest 10 percent of the money charges. What is the dividing point between customers who receive the special plan and those who do not.
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