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The College Board American College Testing Program reported a population mean SAT score of µ 1020 (The World Almanac 2003). Assume that the population standard deviation is 100.
a. What is the probability that a random sample of 75 students will provide a sample mean SAT score within 10 of the population mean?
b. What is the probability a random sample of 75 students will provide a sample mean SAT score within 20 of the population mean?
A random sample of 64 services is selected. What is the probability that the sample of 64 will have a mean service time greater than 114 minutes.
In a randome sample of 32 units of this year's version of the Vagabond the mean output power is 42 watts, with a standard deviation of 8 watts.
Karefree State University has an enrollment of 18,000. Researchers took a sample of 900 and found 477 students wanted a Field Hockey team. Construct the 95% and 99% Interval estimates for the population proportion.
What is the lowest raw score that a client must have on Anxiety Scale A in order to be admitted into this new group? Also assuming some clinics use Anxiety Scale B and often refer their clients to Mary, what is the cutoff point (lowest raw score) ..
Formulate the hypotheses that can be used to determine whether union membership increased in 2006.
The Problem Solving Inventory (PSI) has a normal distribution with mean = 90 and standard deviation = 15. A researcher suspects that the mean for female students is higher than 90.
Three colors have been proposed for a product: blue, green, yellow. The null hypothesis for a goodness-of-fit test would be.
An investment counselor would like to meet with 14 of his clients on Wednesday, but he only has time for 10 appointments. How many different combinations of the clients could be considered for inclusion into his limited schedule for that day?
Interview the officers of every fraternity at each of these 30 institutions. Is this a simple random sample, cluster random sample, or stratified random sample?
Students whose test scores are in the upper 10% are eligible for scholarship opportunities for college. What is the test score that corresponds to the upper 10% cutoff point of the probability distribution?
The theory underlying inferential statistics and other theoretical aspects are subjects we do not often consciously think about in our daily activities.
Consider that 10 observations were selected from a normal population whose variance is 64. Observations are: 58, 62, 45, 50, 59, 65, 39, 40, 41 and 52.
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