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A population of scores with mu = 50 and sigma = 6. The distribution of sample means based on samples of n=36 deleted from a population with sigma = 6 and mu = 50
What are the strengths and weaknesses of correlational and regression studies. What are the concepts of positive and negative correlations, correlation coefficients, confounding, and causality.
The number of power outages at a nuclear power plant has Poisson distribution with a mean of 0.8 outage per month. What is probability that there will be at least 3 power outages in the next year? P
For a population with a mean of =80 and a sd =12, find the z-score corresponding to each sample mean.
Describe the distribution of sample means based on samples of n=36 selected from this population. Of all the possible samples of n=36, what proportion will have sample means greater than 43?
Before receiving the result the physician assigned his patient to the low-risk group (defined on the basis of several variables) with only a 0.5% probability of having HIV. What is the probability t
(a) Describe the distribution of x, height of male college students. a) skewed right
Estimate the mean difference PCB concentration for the fish in the two rivers using a 99% confidence interval.
Estimate the mean difference in pH level for the two years using a 99% confidence interval.
How many different passwords could be made using only these letters? (Ignore the possibility of repeats of letter which are finally used when they crack the code)
What is the probability that the number of uninsured drivers is at most 15? (Use the normal approximation.) What is the probability that the number of uninsured drivers is between 20 and 25? (Use the
If in reality 54% of the residents oppose building the factory in the community, use the normal approximation to the binomial, with the correction for continuity, to approximate the probability that
Shown below are rental and leasing revenue figures for office machinery and equipment in the United States over a seven-year period according to the U.S. Census Bureau.Use these data to run a linear
Use the following data to construct a scatter graph and then fit a regression line to the data. Report the regression formula and the r-squared value from the chart (right click on the line, select
One study has reported that the sensitivity of the mammogram as a screening test for detecting breast cancer is 0.96, while its specificity is 0.93. It is estimated that 10% of women aged 55-75 in a
Let X1 and X2 be two independent random variables, each representing the number of heads in two flips of a fair coin. Let Y=X1 and W=X1X2. Display the joint p.m.f on a graph
According to a survey of American households, the probability that the residents own 2 cars, given annual household income is over $250,000, is 90%.
The time required for the credit application process follows a uniform distribution with the times ranging from 4.5 minutes to 10.5 minutes. What is the probability that each of the two independent
Waiting times to receive food after placing an order at the local Subway sandwich shop follow an exponential distribution with a mean of 45 seconds. Find the probability a customer waits between 1.5
Use a two-tailed test with alpha = 0.05 to determine whether the medication has a significant effect on reaction time. Write a sentence that demonstrates how the outcome of the hypothesis test would a
An accounting firm has been hired by a large computer company to test whether the proportion of accounts receivables with errors in Division1 exceeds 7%.
You wish to test if there is a difference in the average time male and female students spend studying for a business statistics class. Construct the null hypothesis:
Suppose we have a pile of 20 batteries, of which ?ve are dead. If we select 4 batteries at random, let X be the random variable measuring the number of dead batteries in the four we select.
Suppose two dice are rolled. Let X be the random variable measuring the sum of the two numbers rolled.
An industrial hygienist want to be able to estimate the level of carbon monoxide in a plant at the a = 0.01 level. Historical data for the plant has shown that the range of the data is 57 to 1 ppm.