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The lengths of pregnancies are normally distributed with a mean of 264 days and a standard deviation of 25 days. If 100 women are randomly selected, find the probability that they have a mean pregnancy between 264 days and 266 days.
An experimental drug is administered to 30 randomly selected indivduals, with the number of individuals responding favorably recorded. Does this represent a binomial experiment.
Estimate the true proportion of incomplete files for all the bank's commerical loans. write a statement about the confidence level and intervel youn find?
You take a random sample of pizzas sold during a one hour period over the next week. Group 1 and Group 2 The results are shown in the table to the at the bottom of this. Does the ad campaign make a difference? Can you suggest a different methodology ..
Calculate the paired sample t statistic for these mood scores and How has the relation between the mean and the median changed? What does this suggest about the distribution of the transformed data?
Assume a population standard deviation of 350 kilowatt hours. Determine the standard error of the mean. With a 0.95 probability, determine the margin of error or standard error.
What is the value of the slope of the least squares regression line for these data? Round your answer to at least four decimal places.
Identify the null and alternative hypothesis, test statistics, p-value(or range of P-value), critical value(s), and state the final conclusion that address the original claim.
A club has twenty members aged twenty. What are the chances that at least one fourth of them will die before their 65th birthdays?
Of the physics graduates at a university, 30% had a starting salary of $30,000 or more. If five of the graduates are selected at random, find the probability that all had a starting salary of $30,000 or more.
When would you use a one- or two-sample hypothesis test? Provide examples. What are the differences between dependent and independent samples? Provide examples.
If 485 out of the next 500 orders are processed on the same day, would this prove that they are exceeding their goal, using α = .025?
Second treatment had M = 52 with s^2 = 36. Do these data point to significant difference between two treatments? Use the two-tailed test with α = .05.
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