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A one mean Z test is designed to determine whether a. A statistic differs from some specified value.
On a sunny day the probability of hitting bullseye using a bow and arrow is .9. On non sunny days it is .7. Assume the individual shots are independent.
Equivalence testing is carried out by performing two hypothesis tests, allowing a modified version of the null hypothesis to be accepted. The modified version of the null hypothesis is accepted if:
What is the two-sided 95% confidence interval for the population mean given the following sample: x=0,2,3,5?
Which of the following would increase our chances of rejecting a false null hypothesis?
When the degrees of freedom are very large (e.g., 1,000), critical t will have a value
Suppose the mean under the null hypothesis, , = 0. For which of the following two-sided 95% confidence intervals would you fail to reject the null hypothesis using a two-tailed test with =.05?
A- Why is it appropriate to use normal approximation in this setting? B- Write down the appropriate normal distribution C- Use normal apporximation to find the probability that 25 or more homes are
Let us suppose that 17% of all hospital admissions are for gun related injuries. X is the number of gun related admissions in 29 randomly selected hospital admissions
Assume the mean of men height 69 in and the standard deviation 2.8 and the women mean is 63.6. The standard deviation 2.5. What are the percentage of men with height that exceed the length of a day be
Compare the dotplot to a histogram of the data. (choose all that apply.) Dotplots show the frequency of individual data values. The raw data can be retrieved from the histogram, but not the dotplot.
If there is a probabily of 0.80 that a SRS of 40 test takers will have a score less than a certain number what is the score? If the length of newborns are normally distributed with mean 50cm and stand
Make a probability distribution table of X, and the sum of the two die. Calculate the expected value of X X= your bank balance at the begining of a randomly selected day
If the variance is equal to the mean what does that tell you about our assumption of variance for a general linear model? If we can't use a general linear model what are two alternative ways we can
A confidence interval estimate is desired for the true mean gain in a circuit on a semiconductor device. Assume that the gain is normally distributed with a standard deviation of 20. How large must
On a dry surface, the braking distance (in meters) of a Cadillac is normally distributed with a mean of 48m and standard deviation 2.1m.
Suppose 30 percent of people exercise regularly. If you know that a person has high blood pressure, what is the probability that the person exercises regularly?
An advertising agency wants to estimate the mean income of families located in a particular 50-block area of a low-income section of Chicago.
A statistician calculates a 95% confidence interval for the mean income of the depositors at Bank A. The confidence interval is 18,600 to 21,400.(try to use the formula for confidence interval)
A tire manufacturer wants to estimate the mean weight of the tires produced by one of its plants. It takes a random sample of 100 of the tires produced at this plant and finds that the sample mean i
According to a recent study, 10% of women have been a victim of domestic abuse at some point in their lives. Suppose we have randomly and independently sampled 25 women and asked whether they have b
An article gave the following summary information for fracture strengths (MPa) of n = 196 ceramic bars fired in a particular kiln: x = 54.31, s = 3.02
Which do you think you could place more confidence in: an interval estimate or a point estimate of a population mean, and why?
Make a 90% two-sided confidence interval for the mean aluminum content of such specimens over the 52-hour study period. Make a 95% two-sided confidence interval for the mean aluminum content of such
Calculate the value of the test statistic. Calculate the p-value to test the researcher's claim at ? = 0.01 Calculate the critical value at ? = 0.01