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25 seniors from a large metropolitan area school district volunteer to allow their Math SAT test scores to be used in a study. These 25 seniors had a mean Math SAT score of x = 450. Suppose we know that the standard deviation of the population of Math SAT scores for seniors in the district is σ = 100. Assuming the population of Math SAT scores for seniors in the district is approximately normally distributed, a 90% confidence interval for the mean Math SAT score μ for the population of seniors computed from these data is?
Describe when a z-test should be performed as opposed to a t-test? Which (if any) can we use all the time? Why or why not?
A survey of undergraduate students in the School of Business at Northern University revealed the following regarding the gender and majors of the students:
Consider a high school basketball player that is a 70% free throw shooter. During the season, what is the probability that this player makes the third free throw in five shots (exactly 3 shots in 5 attempts)?
To find the probability values in case of raw data, binomial, normal
What is the difference between the null and alternative hypothesis statements in one tailed and two tailed tests? How can manufacturing companies use the standard normal distribution to determine quality control of their products?
Suppose that a certain college class contains 54 students. Of these, 34 are sophomores, 35 are psychology majors, and 7 are neither. A student is selected at random from the class.
Assuming that a hypothesis test of the claim has been conducted and that the conclusion is failure to reject the null hypothesis, state the conclusion in nontechnical terms.
Suppose a study is constructed to test a claim, at a 0.05 signifigance level that a population proportion is 40%. A simple random sample of 750 subjects has a proportion of 42%.
Why do you use the chi-square statistic? What type of data is used with chi square analysis?
Probability of a flush. Poker player holds flush when all 5 cards in hand belong to same suit (clubs, diamonds, hearts, or spades).
Find a 99% confidence interval for the population mean annual number of reported larceny cases in such communities. What is the margin of error? (Round your answers to one decimal place.)
A large discount chain compares the performance of its credit managers in Ohio and Illinois by comparing the mean dollar amounts owed by customers with delinquent charge accounts in these two states.
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