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Thirty percent of American parents allow their children under age 13 to stay home alone after school. (Source: United States Department of Labor, Washington, D.C., 1994). Three parents are randomly selected. Let x be the number of these parents who allow their children under age of 13 to stay home alone after school. Find the probability distribution of x.
I want to estimate within $10 the mean salary of all graduates who were business majors in college. How many business majors would be needed to estimate the mean salary to within 10 with 95% confidence if the population standard deviation is $200.
it is decided to measure the resistance of sheets of a certain metal at temperatures x of 100k 200k 300k 400k and 500k.
A normal distributed population has a mean of 250 pounds and a standard deviation of 10 pounds. Given n = 20, what is the probability that this sample will have a mean value between 245 and 255 pounds?
The amount of time the university professors devote to their jobs per week is normally distributed with a mean of 52 hours and a standard deviation of 6 hours.
Construct a distribution to represent the population such that the survey result above may be seen as a sample from the population.
the mean of the sampling distribution of means is equal to the mean of the population. t-f and why or why
Process of algebraic division and then solving a quadratic equation, find the complex roots. Write down all the factors of the 4th degree polynomial
Annual starting salaries for college graduates with degrees in business administration are generally expected to be between $30,000 and $45,000.
One of the three vice-presidents has not been invitged to attend any of the last four games. what is the probability that this could happen?
Assume the population standard deviations are not the same. At the .05 significance level, is there a difference in the mean waiting time?
For the midcourse PSYC105 test M = 39 (out of 60) and SD = 11.2. What is the deviation score for a person scoring 33 in the test? Complete the formula and show your working and answer.
Construct a 99% confidence interval for the proportion of customers favoring underground installation.
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