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The manager of a photography studio has carried out an experiment to compare the attractiveness of four different poster-size photographs for use in the display window. During 23 business days of the previous month, she randomly selected one of the four photographs for display; the data below show the number of customers for each day that a given photograph was displayed in the window.
At the 0.01 level of significance, examine whether the poster-size photos could be equally effective in attracting customers into the store. Using the appropriate statistical table, what is the most accurate statement that can be made about the p-value for the test?
Construct a 95% confidence interval estimate of the difference in proportion of workers who would like to attend a self-improvement course in the recent study and the past study. Show how you obtain your answer.
The shortlist consists of 7 men and 3 women. Because all the shortlisted applicants are considered to be equally qualified, the names of two of them are drawnn, one after the other at random, to be called for an interview.
Comment on the ability of the emergency service unit to meet the desirable goal, assuming normality. What are some possible actions to consider?
Let the probability of a decreasing employment be 0.6 and the probability of a positive economic trend 0.5. Further, assume that the probability of a decreasing employment given a negative economic trend is 0.7.
What does the result suggest about the effectiveness of cigarette filters?
Make a relative frequency histogram by using ten-point intervals to show the distribution of the scores.
1. Why is the coefficient for "cars produced this year" a positive number? 2. Which is the most statistically significant variable? What evidence shows this? 3. Which is the least statistically significant variable? What evidence shows this?
Assume R is commutative ring. Prove that the following are equivalent: Here N(R) denotes the nilradical of R. The set of nilpotent elements form an ideal called the nilradical of R
Find the probability that in a given winter month at least 140 cars will be rented. Use the normal distribution to approximate the binomial distribution.
In place of all these cash flows you are offered a single payment made to you at time 1. What is the smallest payment you would accept?
The so-called 2-parameter Weibull distribution is defined as follows: F(x) = 1-e-(x/b)a. Using the inverse transform method, derive the formula for generating random numbers for the two-parameter Weibull distribution, where a=3 and b=0.9
keiths florists has 18 delivery trucks used mainly to deliver flowers and flower arrangements in the greenville south
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