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A researcher wants to determine whether the number of minutes adults spend online per day is related to gender. A random sample of 315 adults was selected and the results are shown below. Calculate the chi-square statistic χ2 to determine if there is enough evidence to conclude that the number of minutes spent online per day is related to gender.
A feed company is developing a feed supplement from two grains A and B. Each kilogram of A contains 0.3 grams of protein and 0.2 grams of carbohydrates; each kilogram of B contains 0.9 grams of protein and 0.1 grams of carbohydrates.
Random number generation based on discrete distribution and evaluate the average queue length, waiting time, and percentage utilization for each system.
A portfolio p of consisting 60% of stock X and 40% of stock Y, has a correlation ρpM = 0.62 with the market. What is the portfolio volatility? Statement on the diversification effect.
Given that a particular student tests negative for stress, what is the probability that the test results are correct, and that this student is not overstressed?
What test can be performed to compare the percentage of participants who developed abnormal triglyceride levels between the vitamin A and the trace group? Report a two-tailed p value.
When modelling E(y) with single qualitative independent variable, number of 0 - 1 dummy variables in model is equal to number of levels of qualitative variable.
What was the cost for the 10 percent of employees who incurred the highest dental expense?
The histograms of some sampling distributions are symmetrical. T-F What would make a histogram symmetrical, and give an example of a symmetrical distribution? A random sample of size 36 is to be selected from a population that has a mean μ = 50 an..
Give a 99% confidence interval for the proportion of all U.S. adults who attended church or synagogue during the week preceding the poll.
An accounting firm is planning for the next tax preparation season. From last year's returns, the firm collects a systematic random sample of 100 filings.
Which of the following is NOT true regarding the normal probability distribution.
Suppose you toss ten coins and count the number of heads. What is the probability that the number of heads you count will lie within two standard deviations of the mean?
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