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In the past an autoobile repair shop owner has noticed that sales increased ats certain economic indicators decreased. Based on forecasts of these economics indicators and past observations, the owner has assigned probabilities to sales increases as follows:
Sales increase Probability5% 0.0510% 0.1515% 0.3520% 0.3025% 0.15
Calculate the expected sales increase and the standard deviation.
Find the 95% confidence interval of the mean number of ER patients treated each day at the hospital.
You're the production manager for operation that produces circuit boards. Each board is tested at the end of manufacturing process. Rejected boards are discarded and have no future value.
Clearly identify the independent and dependent variables you would study. Determine whether a one-tail or two-tail test is most appropriate and explain why. Generate a testable null statistical hypothesis and an alternative statistical hypothesis.
What is the likelihood all four of the selected flights arrived within 15 minutes of the scheduled time?
Explain how we test independent against dependent variables in a regression analysis? What's the set up? How are regression analyses often misused / misinterpreted at work or in the news? Cite an example.
To forcast the sample size within 0.02 with 90 percent confidence. The CEO of the organization needs to forcast the proportion of Canadians who own their house.
Research results suggest that IQ scores for boys are more variable than IQ scores for girls (Arden & Plomin, 2006). A typical study looking at 10-year-old children classifies participants by gender and by low, average, or high IQ.
Find the regression equation to predict the cognitive series score from the 7 minute screen score using SPSS. Be sure to write out the equation by hand using the variable names
A mortar shell is s feet above the ground after t seconds, where s=f(t)= -16t + 510t +63. Find the height of the shell 15 seconds after it is fired.
The mean SAT verbal score is 478, with a standard deviation of 98. Use the Empirical Rule to determine what percent of the scores lie between 380 and 478. (Assume the data set has a bell-shaped distribution)
A group of department store buyers viewed a new line of dresses and gave their opinions of them. The results are below: Because the largest number (47) indicated the new line is outstanding, the head designer thinks that this is a mandate to go in..
A deck of playing cards contains 52 cards, four of which are aces. What is the probability that deal of a five-card hand provides?
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