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A student wanted to construct a 95% confidence interval for the mean age of students in her statistics class. She randomly selected 9 students. Their mean age was 19.1 years, with a sample standard deviation of 1.5 years. What is the 95% confidence interval for the population mean? What is the sample mean? Calculate the standard error? Find the t-value corresponding to a sample size of 9. (Hint: Either use a t-table or Tools -> Statistical Tables in Gretl. The d.f. = 8 and the right-tail probability is 0.025.) Construct the 95% confidence interval for the mean age of the students.
Solve the following questions involving fundamental operations on polynomials: Solve the following problems involving applicatins of polynomials:
Using the critical value approach and the sample information reported below, carry out a test of this statement. Let α = 0.05.
Of those not having lung disease, 25.3% are smokers. Determine the probability that a randomly selected smoker has lung disease.
A sales manager wants to know if the sales productivity of her east region is greater than the sales productivity of her west region
Given that the average monthly amount charged is uniformly distributed, what percent of monthly charges are between $100 and $1100?
what is the 25th percentile of a x2 distribution with 20 degrees of freedom? what symbol is used to denote this
Use the normal distribution of women's total cholesterol levels in Exercise 9 for which the mean is 186 milligrams per deciliter and the standard deviation is 37.2 milligrams per deciliter.
Critically discuss the characteristics of integer programming problems. Provide specific instances in which you would use an integer programming model rather than an LP model. Provide real-world examples.
forty percent of the homes constructed in the quail creek area include a security system. quail creek is a very large
Suppose you are planning a sample of employees to determine the monthly average # of vacation days. Standards set: Confidence level of 99% and an error of less than 5 units. Standard deviation be 6 units. What would be the required sample size?
Find the critical value(s). (e) Based on your answers for parts (a) to (d), will you reject or fail to reject the null hypothesis? State your conclusion in the context of the application.
how is the rejection region defined and how is that related to the zscore and p
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