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The national average of times a person checks their email is 32.7 times per month. A random sample of 20 people yielded a mean of 45.4 email checks per month with a standard deviation of 5.3.
An instant lottery provide you the probability of winning on any one play of 0.02. If plays are independent, and you play three times: What is the probability that you will lose on all three of thes
An instant lottery provides you the probability of winning upon any one play of 0.02. If plays are independent, and you play 3 times: What is the probability that you will win on all three of these
A lab technician is tested for her consistency by making multiple measurements of cholesterol level in one blood sample. The target precision is a standard deviation of 1.5 mg/dL or less.
Samples of our students from applied experimental design class were polled about the number of hours they spent studying for last exam. All students anonymously submitted the number of hours on 3x5
Samples of aircrew upon long haul schedules are tested to determine the amount of time they spend in stage IV sleep. It has been hypothesized that individuals suffering from tiredness because of lon
Supposing that the height of college women are normally distributed with the mean of 67 inches and standard deviation 2.5 inches, what percentage of women are between 64.5 inches and 67 inches?
Determine the mean and standard deviation of the sampling distribution for samples of 267 women?
A simple random sample of 81 births of Chinese babies resulted in the mean birth weight of 3245 g and standard deviation of 466 g. Test the claim that the standard deviation of birth weights of Chin
The average age of doctors in certain hospital is 47.0 years old. Suppose the distribution of ages is normal and has a standard deviation of 6.0 years. If 25 doctors are chosen at random for a commi
The number of orders a department fills varies between 0 and 10 from day to day with the following probabilities: .02, .07, .15, .20, .19, .16, .10, .06, .03, .01, and .01. What is the probability o
The Z score for robberies committed is 0.24 and the Z score for assault committed is .74. In which variable does the criminal have a lower relative position. Why?
Assume that X is random variable with P(X = 1) = p and P(X =5) = (1 - p). Assume that the conditional distribution of Y given that X = x is Normal with a mean of 3x and Variance of 1.
Carry out an appropirate hypothesis test, and express the conslusion in a way that would make sense to a 5th grader. Use a significance level of 0.05.
If population of India and China is at 2.3 billion in 2008, how many years will it take to reach 8.9 billion-assuming rate of growth is constant at 2.4%.
Preliminary plans are underway for construction of a new stadium for the major league baseball team. City officials question the number and profitability of luxury corporate boxes planned for the up
At the coal mine there is machine that fills railroad cars. When 61 cars were filled, the mean amount per car was 6 tons (12,000 lbs) with standard deviation of 250 lbs. Calculate a 90% interval for
A pan of water is brought to boil and then removed from the heat. Every five minutes thereafter the difference between the temperature of the water and the room tempreture is reduced by 50%. If room
A study presents pH measurements of soil specimens taken from 3 different types of soils. The results are given in the following table Soil type pH Measurements Alluvium 6.53, 6.03, 6.75, 6.82, 6.24
A) Test this statement with hypothesis test for ?=0.01 and also compute the p value. B) If the true mean age is 30 what is the probability of Type II (?) error for the test done in part A?
Calculate the market share for each of the companies. Has there been the change in the market share for any of the companies? (Don't round intermediate calculations. Round your answers to 1 decimal
The assumptions for the t-test for related samples are same as those for t-test for independent samples except for requiring.
Two applicants scored the interval from 700 to 749. Two applicants scored in the interval of 450 to 499 and 16 applicants scored in an interval 500 to 549.
If the probability of a high demand is 20% (or 0.20) and the probability of a low demand is 80% (0.80), what are your expected profits for any given day?
Discuss what happens to the graph of the function f(x) = log(b)x when 'b' is equal to 1? Is the following statment true or false, when 'b' = 1, g(x) = b^x and h(x) = log(b)x intersect at the ordered p