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An investigation of past consumer surveys done by a company reveals that 2/3 of customers contacted respond to the survey. The marketing manager wants to do a new survey and plans to contact 198 customers. (a) How many responses should the manager expect to receive? (b) Give an approximation of the probability that 140 or more customers will respond. (c) Give an approximation of the probability that 135 to 150 customers will respond. (d) Give an approximation of the probability that 130 or less customers will respond. (e) Compare your approximate answers with the exact probability values obtained on Excel.
The owner of a car dealership wants to determine whether there is a relation between the income level and the type of vehicle purchased in their dealership.
Two rainstorms occurred in one week in a certain area. The first storm lasted 25 hours, and the second storm lasted 35 hours, for a total 2050ml of rain.
question 1. select any two qualitative data of your survey. from your qualitative data carry out at least two
What is the relative risk between exposure to the drug and malformations and what type of study design is this?
This distribution is positively skewed. The standard deviation of the population is not known.
Identify the null hypothesis, alternative hypothesis, test statistic, Critical Values, conclusion about the null hypothesis, and final conclusion that addresses the original claim.
Consider a random sample of six families who are asked if their children have an influence on their vacation destination.
The heights of 18 year old men are approximately normally distributed with mean 68 inches and a SD of 3 inches.
If there are no other cars coming and there are n bays, k cars waiting ahead of you, what is the probability you will be the last person to finish washing your car?
What are the null and alternative hypotheses? In what way do the two estimates of the defect rate in question 3g differ?
In Dallas some fire trucks were painted yellow (instead of red) to heighten their visibility. During a test period, the fleet of red fire trucks made 143, 348 runs and had 20 accidents, while the fleet of yellow firetrucks made 135,035 runs and had 4..
Three automobiles are selected at random, and each is categorized as having a diesel (S) or a nondiesel (F) engine (so outcome are SSS,SSF,ect.) If X= the number of cars among the three with diesel engines, list each outcome in S and its associate..
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