Question 1: Mathew has been hired to visit the local shopping mall to conduct a

Question

Question 1: Mathew has been hired to visit the local shopping mall to conduct a survey about the upcoming political election. He needs to select respondents at the mall and ask them questions about their voting tendencies. Mathew decides to set up a booth with a sign offering to pay shoppers $20 if they respond to his survey. Which of the following sampling techniques best A) stratified B) convenience C) simple random D) systematic E) cluster Question 3) Suppose the average weight for adult males in Harrison County is 190 lbs with a standard deviation of 20. Now suppose we take a random sample of 143 adult males in Harrison County. What is the probability that the average weight of our 143 subjects is bigger than 193 lbs? a) 0.9633 b) 0.0367 c) 0.5596 d) 0.2743 e) Not enough information provided Question 5: Which of the following about the binomial distribution is not a true statement? a) The probability of the event of interest must be constant from trial to trial. b) Each outcome is independent of the other. c) Each outcome may be classified as either "event of interest" or "not event of interest." d) The variable of interest is continuous e) the number of trials n can be at least 30. Question 4: When the discrete random variable is expressed in terms of dollars, the mean of the distribution is known as the A) expected value of sample information B) expected value of the distribution C) average value of the distribution D) expected monetary value E) Left or Right side skewed distribution.

Explanation / Answer

Kindly post 1 question per post, as per forum rules. Here' answer to Q3

Q3.

The normal distribution params are here:

Mean = 190
Stdev = 20
n = 143

P(Xbar>193)
= P(Z> (193-190)/(20/sqrt(143))
= P(Z>1.794)
= 1-.9633
= .0367

Answer is b.

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