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Q1) Market research firm wishes to conduct survey to evaluate average amount spent by visitors to within $20. History tells us population standard deviation is $398.
a) How large does my random sample size (n) require to be at 95% confidence interval?
b) How large does my random sample size (n) require to at 98% confidence interval?
Q2) A researcher claims average Hotel Rate in San Diego CA is $156/night in the month of November 2009. You think this is low, and wish to prove average rate is higher, so you arbitrarily gather sample of 25 data points from different hotels on random dates in that month. You determine the average rate of 168 with standard deviation of 30. By using significance level a = .05, and suppose a normal distribution what does evidence conclude?
Given 7 male individuals in a Physical Education course, the number of sit ups each individual can do in a one minute period was recorded:
A research analyst regresses the number of calls for service (Y) on the Fahrenheit temperature at 4:00 in the afternoon (X). The regression equation finds: Y = 62 + 2.4 X with an r 2 of .67
The ________ is the probability of observing a sample value as extreme as, or more extreme than the value observed, given that the null hypothesis is true.
Suppose you found that in doing the hypothesis test, you were able to reject the null hypothesis. What is the most appropriate conclusion to draw?
Gas consumption of 3 cars (labeled car A, car B, and car C) using 4 different kinds of gasoline. Is there difference among kinds of gasoline?
Dividend is expected to grow 7% a year for next 3 years and then at 5% a year after that. Determine the expected dividend per share for each of the next five years?
A case-control study of relationship between liver cirrhosis among both non alcoholics and alcoholics. Describe whether smoking is confounder.
Graph the distribution using a histogram. Calculate the mean and standard deviation.
For the data giben below, prepare a R-chart. Note that the sample size is three.
Select the variable team salary and find the mean, median, and the standard deviation
Using part(a), explain to investor differences between distribution of performance figures for the 2 kinds of stock funds.
What are the expected value and variance of the following probability distribution?
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