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Suppose 39 women used skin cream for 22 weeks. At the end of the period, a dermatologist judged whether each womam exhibited skin improvement. The results show that 22 women improved. Do the data provide sufficient evidence to conclude that the cream will improve the skin of more than 50% of women? Test using α=0.05 and the p-value method.
Farrell Corporation's common stock is $25. The price is expected to increase by $5 over the coming year. The standard deviation of the expected price is $3.
If you were to accept the null hypothesis, even though the null hypothesis was false, what type of error would you have commited?
A financier whose specialty is investing in comedy shows has observed that, in general, shows with "big- name" stars seem to generate more revenue than those shows whose stars are less well known.
When a researcher tests at the ,p=.05,p=.01 or p=.001 levels they can only be used in relationship to evaluate risk to patients in implementing the decisions based on research findings.
A sample of 121 provided a sample mean of 77.3. The population standard deviation is known to be 16.5. Compute the value of the test statistic.
If you want to be 95% confidence of estmating the population mean to within a sampling error of +-4 and the standard deviation is assumed to be 10, what sample size is required?
mean is calculated for each sample, then the average distance between M and u would be:
The model that result is: y= 0.6 + 1.2x, where the dependent variable is the amount of sales, in thousands of dollars, realized during the week and the independent variable is the amount spent on newspaper advertising, in hundreds of dollars, duri..
Madison Metals recently reported $9,000 of sales, $6,000 of operating costs other than depreciation, and $1,500 of depreciation. The company had no amortization charges and no non-operating income.
If we want to estimate the populations mean travel-to-work time San Francisco residents with a margin of error of 1 minute, what sample size should be used? Assume 95 percent confidence.
Determine the values of mean M and standard deviation s for original sample?
One of the 4 bus drivers is also randomly selected. Let Y denote the number of students on his bus. Compute the expectations and variances of X and Y?
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