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A sample of 40 observations is selected from one somewhat normal population. The sample mean is 102 and the sample standard deviation is 5. A sample of 50 observations is selected from a second source. The sample mean was 99 and the standard deviation was 6. Conduct a test of the hypothesis to determine if these population means are different using the .05 level of significance. Use 2.055 for the a priori level.
A coin is flipped e times and heads (h) or tails (t) are recorded:
How many participants need to be enrolled in each group to have 90% chance of detecting a significant difference using a two-sided test with a a= .05 if compliance is perfect?
In a Gallup Poll of 1005 randomly selected Americans in April 2006, 482 responded "yes" to the question, "Do you consider the amount of federal income tax you have to pay as too high?"
He measures the heights of 25 men from this century and finds the mean and standard deviation for his sample.
Suppose prior elections in Louisiana indicated it is necessary for a candidate for governor to receive at least 80 percent of the vote in the northern part of the state to be elected.
The amounts of money requested on home loan applications at Down River Federal Savings follow the normal distribution, with a mean of $70,000 and a standard deviation of $20,000.
In the regression analysis involving 25 observations following estimated regresion equation was developed. hat(Y) = 10 - 18x1+3x2+14x3 also follwoing standard errors. Test stastic for testing significance of model is?
Suppose that in a hypothesis test with null hypothesis = 13.0 at 0.05, that a value of 11.0 for the sample mean results in the null hypothesis not being rejected.
The director of golf for the Links Group wishes to study the number of rounds of golf played by members on weekdays. At the .05 significance level, is there a difference in the number of rounds played by day of the week?
A study to see how well marital dissolution was predicted by the personality scores of husbands and wives was published in the Journal of Personality and Social Psychology.
A recent article in the Wall Street Journal reported that the 30-year mortgage rate is now less than 6 percent. A sample of eight small banks in the Midwest revealed the following 30- year rates (in percent):
If jurors are selected randomly from an adult population, a nd the probability that all 12 jurors are white when the population is?
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