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Assume that a set of test scores is normallyh distributed with a mean of 110 and a standard deviation of 25. Use the 68-95-99.7 rule to find the following quantities.
a. the percentage of scores less than 110 is %.b. the percentage of scores greater than 135 is %.c. the percentage of scores between 60 and 135 is %.(each answer should be typed in as a decimal or an integer)
A normal population has an average of 80 and a standard deviation of 10. You select a sample of 25. Calculate the probability that the sample mean
From past estimates, manager thinks that about 4% of customers have expressed dissatisfaction. What sample size must you use for this survey?
If the residual plot, i.e., a graph in which the residuals for a particular regression model are plotted along with their associate value of x as an ordered pair, shows a parabolic pattern, which of the following assumptions of the simple regressi..
Determine the covariance matrix for values of this process at time t=1,2,3,4. Determine its inverse(numerically) and write formula for pdf of corresponding random vector.
In a sample survey, 200 of 800 individuals enrolled in our managed-care organization indicated that they favored a proposal to extend office hours from 5:00 to 8:00 p.m. Construct a 95% confidence interval for the corresponding true proportion.
Find the mean/standard error of the sampling distribution of the proportion. Assume that 26% of students at a university wear contact lenses. We randomly pick 300 students.
use the normal approximation to the binomial to determine what is the probability that: 100 or more murder are committed with a firearm? a. 0.452 b. 0.548 c. 0.367 d. 0.164.
f no more than 5% of the containers are to weigh less than 15.8 oz, what must the standard deviation of the weights equal?
Using the menu systems, request descriptive statistics (mean, s.d. and variance) for both your original variables
According to an article, 19% of the entire US population have high-speed access to the Internet. Random samples of size 200 are selected from the US population.
The grades of 20 students are listed in the stem and leaf diagram below. What is the probability of randomly selected student to have a grade more than or equal to 60 and less than or equal to 80.
Plot the data on the same line and give your impression regarding any apparent differences between the two companies.
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