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What is the point estimate of the proportion of people who prefer going to a shopping mall in their spare time? At 95% confidence, what is the margin of error associated with this estimate?
Where in everyday life do you notice which you make decisions based upon averages? On a popular outcome that is not the average? On the chance that something will occur? On the chance that something
Determine the critical value of z? Report the critical value CLOSEST to your calculated z-score. (Answer to 2 decimal places.)
Michelle employed a sample of 50 U.S. cities to determine the relationship between crime, or annual property crimes per 100,000 persons, and income, or median income per capita.
A production procedure is checked periodically by a quality control inspector. The inspector selects simple random samples of 30 finished products and computes the sample mean product weights (line
The amount of gasoline sold daily at service station is value of x of random variable X that is approximately uniformly distributed with minimum of 2000 gallons and max of 5000 gallons. Find out th
For past 103 years, a certain state suffered 28 direct hits from the major(category 3 to 5) hurricanes. Suppose that this was typical and the number of hits per year follows poisson distribution. Co
Based upon the information in part (c), test the hypothese Ho: "pie"<+0.5 vs H1: "pie">0.5 and find out the critical value of sample proportion (P).
Perform the chisquare test for uniform distribution. At ? = .05, does this sample contradict the assumption that sales are same for each beverage?
The number of hits to the web site follows a poisson process. Hits take place at the rate of 1.6 per minute between 7:00pm and 9:00pm. Given below are three scenarios for number of hits to be web si
A researcher is interested in determining the noise levels in decibels at area urban hospitals. She wants to be 90% confident that her estimate is correct.
A random sample of 100 grapefruits is gathered and mean diameter is calculated. Determine the probability that the sample mean is greater than 6.01 inches?
A sample of 140 golfers showed that their average score on a particular golf course was 93.38 with a standard deviation of 4.36. Answer each of the following.
Given a level of confidence of 99% and a population standard deviation of 13, answer the following:
Consider the population with and µ=65.7 and Ö=5.52, (A) Compute the z-score for x =63.1 from a sample of size 13. (B) Could this z-score be used in calculating probabilities using Table 3
Verbal ability scores have u=50 and 0=10. The distribution is normal. A new drug is touted as having effect of raising verbal ability by 5 points, and we recruit the sample of n = 49 people to test
A researcher studying attitudes of parents of preschool children interviews the random sample of 50 mothers, each and every having one preschool child. He asks each mother, "How many times did you c
A raffle has grand prize of a Alaskan cruise valued at $ 10500 with second prize of resort vacation valued at $1300. If each ticket osts $2 and 9200 tickets are sold, determine the expected winnings
According to the airline a particular flight is on time 95% of time assume 120 flights are randomly selected calculate the mean and standard deviation of random variable x, the number of on-time fli
Use the central limit theorem and the histogram correction to find an approximation for the probability that the number of heads is between 140 and 160.
A box is to be constructed so that its height is five inches as well as its base is Y inches by Y inches, where Y is a random variable described by the pdf, fY(y) = 6y(1 - y), 0<y<1. Determine
In an effort to increase production of an automobile part, the factory manager decides to play music in the manufacturing area. Eight workers are selected and the number of items each produced for a
A student thinks that the average grade upon the statistics final examination is 87. A sample of 36 final examinations is taken. The average grade in sample is 83.96 with standard deviation of 12.
Determine the point estimate of proportion of people who will like the cereal? Construct a 95% confidence interval for true proportion of people who will like the cereal.
Fifty students are enrolled in an Economics class. After the first examination, a random sample of 5 papers was selected. The grades were 60, 75, 80, 70, and 90. Determine the standard error of the