Assume that when adults with smartphones are randomly selected, 62% use them in meetings or classes. If 9 adult smartphone users are randomly selected, find the probability that exactly 2 of them...

Assume that when adults with smartphones are randomly selected, 62% use them in meetings or classes. If 9 adult smartphone users are randomly selected, find the probability that exactly 2 of them...

A certain group of test subjects had pulse rates with a mean of 77.3 beats per minute and a standard deviation of 12.2 beats per minute. Use the range rule of thumb to identify the limits separating...

one sample of n = 10 score has a mean of M = 8, and a second sample of n = 5 score has a mean of M = 2. If the two sample are combined, what is trhe mean for the combined sample.

How to calculate the mean level when standard deviation is 15, and the raw score is 110 which is located in the 80th percentile?

Pax World Balanced is a highly respected, socially responsible mutual fund of stocks and bonds. Vanguard Balanced Index is another highly regarded fund that represents the entire U.S. stock and bond...

A group of 50 teachers and school administrators attended a convention. If any two persons had been picked at random, at least one of the two would be a teacher. From this information, what percentage...

Reseacher in australia carried out experiment to know how coffee mug color effects the rating of people about its flavor intensity. On the basis of the results from different volunteers, the researchers...

Assume that there are 7 different issues of Popular Science magazine, 6 different issues of Newsweek, and 3 different issues of Sports Illustrated, including the December 1st issue, on a rack. You...

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Excel has a built-in statistical function =CORREL(array1,array2), which works great to correlate two sets of data (Pearson correlation)...

The human resources department of a very large organisation is trying to determine the proportion of all employees that are satisfied with their current position. They randomly select 81 employees...

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Why are national polls always looking at 1,000 people. The magical significance of 1,067! How to determine a confidence level and a...

Determine which sampling method was used in the following study. A certain species of tree in Gove County, Kansas was dying off due to an infestation. A study was produced to determine the...

For any positive integer n, how do you write a combinatorial proof of the identity (2n choose n) = the summation from i=0 to n (n choose i)*(n choose n-i) ?

A) 26.55 B) 0.62 C) 0.7324 D) 62.50 E) 10

A certain group of test subjects had pulse rates with a mean of 79.3 beats per minute and a standard deviation of 12.8 beats per minute. Would it be unusual for one of the test subjects to have a...

Last year 52,000 american of Colon cancer of the 155,000 diagnosed cases. 80% of those who died did not have yearly colon screenings after age 50. Last year, 50% of men aged 50 and over had colon...

Using paired samples t-test following Pre-Post questionnaire, should I enter (into SPSS) observations as the individual responses (eg. each row is the pre / post data from one subject answering one...

Age. Gender. Job Satisfaction. Work Hours per week. Hours on Social media per week. Life exciting or dull?

Take that I am in customer service and encounter 2000 customers in a six month period. I ask those customers to complete a survey about my performance, knowledge and curtesy. How many of the surveys...

A person is presented with ten choices, five of which are correct, and five that are wrong. They have to select exactly five of the choices. If the person is completely guessing,...