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A set of 50 data values has mean of 15 and a variance of 25. Find out the standard score of a data value = 30.
When using the Pearson r correlation coefficient (as well as virtually all other statistical procedures), it is significant to pay attention to the sign of a coefficient (plus or minus). Why, then d
In what way is the meaning of squared point-biserial correlation coefficient the same as the meaning of the squared Pearson r correlation coefficient? Are there any difference between these two squa
The data from any research study that uses the t test for the difference between two independent sample means can also be analyzed by computing a point-biserial correlation coefficient.
One card will be randomly chosen from the standard 52-card deck of cards. Determine the probability that it will be the jack of hearts?
The claim that "40% of those persons who retired from an industrial job before the age of 60 would return to work if a suitable job was available," is to be investigated at the 0.02 level of risk.
He chooses a random sample of 49 trucks passing the weighing station and finds the mean weight is 15.8 tons. The population standard deviation is 3.8 tons. What is the 95 percent interval for the po
A study was conducted to estimate the mean amount spent on birthday gifts for a typical family having two children. A sample of 175 was taken, and the mean amount spent was $210.68.
A 98% confidence interval estimate for the population mean was computed to be (26.4, 47.8). Estimate the mean of the sample, which was used to determine the interval estimate (show all work).
A car arriving at the fork chooses Main Street with probability 3/4 and Willow Street with probability 1/4. Let X be the random variable which counts the number of cars that, in a given unit of time
Suppose that the mean score on a certain aptitude test across the nation is 100, and that the standard deviation is 20 points. Find the probability that the mean aptitude test score for a randomly s
Suppose that the mean score on certain aptitude test across the nation is 100, and that the standard deviation is 20 points. Find out the probability that the mean aptitude test score for the random
Assuming that the population variances from both types of digital cameras are equal, is there evidence of a difference in the mean battery life between the two types of digital cameras (a = 0.05)?
An IQ test is designed so that the mean is 100 and standard deviation is 21 for the population of normal adults. Find out the sample size necessary to determine the mean IQ score of statistics stude
Use relative frequencies to estimate the probability that a seed WILL NOT germinate. What is your estimate? (Round your answer to 3 decimal places.)
A system contains two components A and B connected in parallel. Compoenents function independetly. Probability for compoenent A to fail is 0.1 Probability for component B to fail is 0.05 Find prob.
A botanist has developed new hybrid cotton plant which can withstand insects better than other cotton plants. But, there is some concern about the germination of seeds from new plant. To determine t
A car can drive X milers per gallon, where X has normal distribution with mean of 40 miles and standard deviation of 2 miles. Find out probability that this car will drive over 205 miles with five g
The commerce department in the california county claims that the mean rental for a 3 room apartment is $850.
The following Data was collected to find out whether or not Nassau Community College Students work 18 hours per week :
Determine the difference between the reliability of a measure and the validity of measure? Determine the difference between test-retest reliability and split-half reliability?
Compute the (exact) probability that at most one of them will be defective, Compute the same probability using Poisson "approximation.
In order to determine the proportion of of customers using self-service pumps, a gas station wants to find the number of customers she must survey so her margin of error is no more than 8% and her c
The following Data was gathered to find out whether or not Nassau Community College Students work 18 hours per week :
Construct a 99% confidence interval for the difference between the mean drying time for paint type A and the mean drying time for paint type B.