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Hoping to lure more shoppers downtown, a city builds a new public parking garage in the central business district. The city plans to pay for the structure through parking fees. During a 2 month period (44 weekends), daily fees collected averaged $126, with a standard deviation of $15.
(a). What assumptions must you make in order to use these statistics for inference?(b). Write a 90% confidence interval for the mean daily income this parking garage will generate.
(c). Explain in context what this confidence interval means.(d). Explain what "90% confidence" means in this context.
Unacceptable bacterial contamination on 20 flights. (a) At α = .05, does this sample show that more than 10 percent of all flights have contaminated water? (b) Find the p-value.
A psychologist claims that more than 6.3% of the populations suffer from professional due to greate shyness. Categorize the Type II error in this context.
Three dessert packages to choose from. In how many different ways could the couple select an appetizer package, a main course,and a dessert package?
If 45 houses are randomly selected, what is the probability that four of the houses will be burglarized? Is this a binomial experiment? Explain how you know.
What is the chance that stock will fall by more than 15% next month? What extra assumption are you making when replying this question?
You are appraising the quality of diamonds for your importer. A diamond without a clear center (opaque center) shall be downgraded and sold at discount.
What are planned comparisons? Why do researchers making planned comparisons need to make the Bonferroni correction? If a researcher is making four planned comparisons using the .05 significance level
A local tire dealer wants to predict the number of tires sold each month. He believes that the number of tires sold is a linear function of the amount of money invested in advertising.
A standard slot machine has three reels. The first reel has 3 walnuts, 7 cherries, 3 oranges, 5 lemons, 1 bell, and 1 jackpot bar. The second reel has 7 cherries, 6 oranges, 1 lemon, 3 bells, and 3 bars. The third reel has 4 walnuts, 7 oranges, 5 ..
A certain firm specializing in the manufacture and sale of free time clothing has 80 retail stores in Florida and 140 in California. With each state as a stratum, the firm wishes to estimate average sick-leave time per employee for the past year
Consider the following estimated regression equation, based on 10 observations.
Identify the null hypothesis, alternative hypothesis, test statistic, P-value or critical value(s), conclusion about the null hypothesis, and final conclusion that addresses the original claim.
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