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How is the denominator influenced by sample variability, and given this, why do we need a larger sample for between subject designs compared to within subject designs?
Suppose that an eddy current nondestructive evaluation technique for identifying cracks in clinical metal parts has a probability of around .20 of detecting a single crack of length .003 in. in a ce
Compute r2 to measure the size of the effect. Compute a 90% confidence interval to estimate the population mean difference
The life in hours of a laser is known to be normally distributed with a standard deviation of sigma = 20 hours. A sample of 15 lasers and their lives is as follows: 708, 692, 736, 707, 708, 696, 708
Construct a 90% CI for the true proportion of masks of this type whose lenses would pop out at 250o.
Use graphical sensitivity analysis to determine the range of values of the probability of state of nature s1 over which each of the decision alternatives has its largest expected value. State of Nat
Compute 98% confidence interval for the national average error based on these sample results. Assume the travel agent errors are normally distributed in the population. How wide ia the interval? Int
A student curious about the average number of chocolate chips in a commercial brand of cookie estimated the standard deviation to be 8. If he wants to be 99% confident in his results
A major hurrican is a hurricane with winds of 111 miles per hour or greater. During the last century, the mean number of major hurricanes to strike a certain counttry's mainland per year was about 0
Find a 90% confidence interval for the difference in average absorption time for the two drugs. Does it appear that one drug is absorbed faster than the other (at the 90% level)? Explain.
An experiment was designed to estimate the mean difference in weight gain for pigs fed ration A as compared with those fed ration B. Eight pairs of pigs were used. The pigs within each pair were lit
Most of the students selected will not respond. The students selected can't be consideed a random sample from the population of all students in the course.
Customers arrive at a local ATM at an average rate of 20 perhours. Assume the time arrivals follow the exponential probability distribution. What is the probability that the next customer will
Fran believes that the odds in favor of her team winning the basketball game tomorrow are 9 to 7. What is the (subjective) probability that her team will win the game?
A die is loaded, and a 6 comes up with probability 1?4. If the die is tossed twelve times, find the probability that
When computing a t-test, it is important to distinguish between directional and nondirectional hypotheses as the direction will determine the rejection regions. Describe how the rejection regions w
The mean per capita consumption of milk per year is 113 liters with a variance of 576. If a sample of 193 people is randomly selected, what is the probability that the sample mean would differ from
Determine a 99 percent confidence interval for the population mean price. Would it be reasonable to conclude that the population mean was $2.50? Why or why not?
A local police precinct has seen a recent increase in the number of complaints filed regarding how officers are interacting with the public. Before addressing the issue, the commander wants to know
Compute a one-sample t-test comparing the age of your sample to the age of the general population of college students in traditional on-ground universities. Assume the population mean is 21.
A TV show, Lindsay and Tobias, recently had a share of 10, meaning that among the TV sets in use, 10% were tuned to that show. Assume that an advertiser wants to verify that 10% share value by condu
What is the weighted average (Y) of the logs of the estimated odds ratios for the two tables? Report the number to the nearest hundredth decimal place.
Find the value of t for the difference between two means based on an assumption of normality and this information about two samples. (Use sample 1 - sample 2. Give your answer correct to two decimal
Test against a two sided alternative, the null hypothesis that the population mean to debt ratios are the same disclosers and non disclosers of earnings forecasts.
Suppose cattle in a large herd have a mean weight of 1337 lbs and a standard deviation of 64. What is the probability that the mean weight of the sample steers would differ from the population mean