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A random sample of 40 college students revealed that the mean number of DVDs watched last month was 6.20. At the 0.05 significance level, can we conclude that college students watch fewer DVDs a mo
Suppose that (X,Y) have joint density function f(x,y)=7yx^2 on the region defined by 0<=y<=X^2<=1 Determine P(X^3<=Y)
Let X be a continuous distribution with probability density function: f(x))=2 / (x+3)^2 if x??2 and f(x)=0 otherwise Let Y=X^2. Determine P(Y<=4)
The sample mean is 49, and the population standard deviation is 5. Conduct the following test of hypothesis using the 0.10 significance level. What is the value of the test statistic? What is the p-
In the repeated-measures ANOVA, individual differences are not a source of variability for the error SS because _____.
Finally, he brought 4 shirts and 2 sports coats and paid $20.94. How much was he charged for each shirt, each pair of slacks and each sports coat?
The mean for Coaches is 90 with a sd of 12, and the mean for Players is 70 with a sd of 10. What is the probability that a Player drawn at random will score above the income associated with the 10th
A random sample of 10 parking meters in a beach community showed the following incomes for a day. Assume the incomes are normally distributed. $3.60 $4.50 $2.80 $6.30 $2.60 $5.20 $6.75 $4.25 $8.00 $
Are America's top chief executive officers (CEOs) really worth all that money? One way to answer this question is to look at the annual company percentage increase in revenue versus the CEO's annual
Assume that the result is a sample size beyond what you can obtain. Use the compromise function to compute alpha and beta for a sample approximately half the size.
A researcher with Ministry of Transportation is commissioned to study the drive times to work (one-way) for U.S. cities. The underlying hypothesis is that average commute times are different across
If Jeff and Jack each bowl one game, then assuming that their scores are independent random variables, approximate the probability that the total of their scores is above 285.
Test hypothesis 9.57083=10.55852=9.17 n = 9.575083 + 10.55852 + 9.17 = 29.303603, k = number of samples = 3 Therefore, numerator degrees of freedom = k - 1 = 2 , denominator degrees of freedom = N -
We're interested in knowing whether canceling the body's electric field reduces the healing rate. Give a 90% confidence interval for the difference in healing rates (control minus experimental).
Which of the following is false about simple linear equations
A committee of 2 is chosen at random from a population of 7 men and 8 women. What is the probability that the committee will consist of 1 man and 1 woman? in fraction form
If other factors are held constant, if the Pearsons correlation between X and Y is r = 0.80, then the regression equation will produce more accurate predicition then would be obtained if r = 0.60
What is the research hypothesis? Should you conduct a one- or a two-tailed test? Why Present the five-step model, testing your hypothesis at the .05 level. Whad do you conclude?
A medical research team studied the number of head and neck injuries sustained by hockey players. Of the 319 players who wore a full-faced shield, 195 sustained an injury.
Smith is a weld inspector at a shipyard. He knows from keeping track of good and substandard welds that for the afternoon shift 5% of all welds done will be substandard.
The current necessary to produce a certain level of brightness of a television tube was measured for two different types of glass and three different types of phosphor, resulting in the accompanying
For a continuous random variable X, P(28 ? X ? 68) = 0.2 and P(X > 68) = 0.11. Calculate the following probabilities. (Leave no cells blank - be certain to enter "0" wherever required. Round your
Test the research hypothesis that men use the internet more hours than women, set alpha at .05. Would your decision have been different if alpha were set at .01?
The area under a standard normal density curve with a mean of 0 and standard deviation of 1 is
Assume that the heights of men are normally distributed with a mean of 68.7 inches and a standard deviation of 2.1 inches. If 36 men are randomly selected, find the probability that they have a mean