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A professor in the psychology department would like to determine whether there has been a significant change in grading practices over the years. It is known that the overall grade distribution for the department in 1985 had 14% As, 26% Bs, 31% Cs, 19% Ds, and 10% Fs. A sample of n=200 psychology students from last semester produced the following grade distribution:
A B C D F32 61 64 31 12
Does the data indicate a significant change in the grade distribution? Test at the .05 level of significance.
Again multiply 200 by the expected proportions given in the problem(i.e. 14%, 26%,... etc) to get the expected frequencies. Then use the formula to compute chi square.
Calculate the probability that the median of the sample or average medians is:
Give an example of how Regression Analysis can be used in your work to make a business decision. Give the dependent and independent variables.
An investor estimates that there is a 1 in 10 chance that a stock purchase will lose 20% of its value, a 2 in 10 chance it will break even, a 4 in 10 chance it will gain 15% and 3 in 10 chance it will gain 30%. What is the expected return.
A question has these possible choices - excellent, very good, good, fair, and unsatisfactory. How many degrees of freedom are there using the goodness-of-fit test to the sample results?
The password of 52 digit sequence is made. It consists of 0 and 1. How various different possibilities exist for networks password.
Suppose the inspector is unhappy with the previous result and would like to resample. How many rolls should be sampled to estimate the mean tensile strength within 1.5 PSI with 95% confidence?
During the 10-month period during which these six exposures were detected, a total of 2,316 general anesthetics using isoflurane or desflurane were delivered in operating rooms monitored by mass spectrometry.
Test the hypothesis that no difference exists between the groups at α = .05 and perform and report all related tests and statistics.
A radio station wants to know if residents in their area are in favor of a proposed tax increase. They invite listeners to call in to respond to the poll. 645 of the 800 who responded were against the tax.
A researcher hypothesizes that the variation in the amount of money spent on business dinners is greater than the variation of the amount of money spent on lunches. The variance of nine business dinners was $6.12 and the variance of 12 business l..
The standard deviation of is usually called the A. randomized standard error B. standard error of the sample C. standard error of the population D. standard error of the mean
Find the test statistic value for testing the equality of proportion variances.
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