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Question 1:
a) A statistics practitioner wants to test the following hypotheses:
Ho: p=.70H1: p> .70
A random sample of 100 produced B (beta) =.73
Calculate the p-value of the text.
b) Repeat part a with p = .72
c) Repeat part a with p = .71
d) Describe the effect on the z-statistic and its p-value of decreasing the sample proportion.Question 2:
Determine the sample size necessary to estimate a population proportion to within .01 with 90% confidence assuming you have no knowledge of the approximate value of the sample proportion.
If the least squares equation for sales data going from 1984 to 1990 is Y1 = 10 + 1.3X (in $ millions) found using the coded method, what is the plot on the straight line for 1988? (x and y values)
A sample of 400 individuals participated in the taste test and 80 indicated they like the taste. At a 5% significance level, test to determine if at least 22% of the population will like the new soft drink.
Report descriptive statistics, assumptions tests, effect sizes (partial eta) as well as tests of statistical significance.
What is the probability that a randomly chosen employee is an Administrator if the employee has the opportunity of gaining promotion next year?
In, addition, the company has decided to purchase at least three of the new Econo-Tankers for use on short-run, low-demand routes. As a final constraint, the conpany deos not want more than half the new models to be Super Tankers.
An airline has a policy of booking as many as 17 persons on an airplane that can seat only 16. Find the probability that if the airline books 17 people, not enough seats will be available.
What terms describe the fit of a regression equation to the data? What is the practical use of the regression equation in the real world? Explain with some examples.
Do you agree that if two events are mutually exclusive then these two events will be independent and provide one business-related example each, with explanation, for mutually exclusive and independent events
A sample of 60 smokers has a mean cotinine level of 125. Assuming that sigma=25, find the 90% confidence level estimate of the mean cotinine level of all smokers.
The average 1-ounce chocolate chip cookie contains 110 calories. A random sample of 15 different brands of 1-ounce chocolate chip cookies results in the following calorie amounts. At a=0.01 level
The average cost of a renting a compact size car in a major metropolitan area is R51.74 with a standard deviation of 7.48. Assume a normal distribution.
The data returned could be categorized as follows: participants--designers and non-designers, and males and females; emotions categorized by valence--6 positive and 6 negative; typeface stimuli categories--weight (bold or light), classification (seri..
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