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Find the 95% confidence interval for the difference between two means based on this information about two samples. Assume independent samples from normal populations. (Use conservative degrees of freedom.) (Give your answers correct to two decimal places.)
A simple regression model has been developed using a sample of 11 pairs of observations. The sum of squares of error is 237.64. The standard error of the estimate is:
A presidential candidate's aide estimates that, among all college students, the proportion p who intend to vote in the upcoming election is at most 65%.
let ft be the probability density function for the time it takes you to drive to school in the morning where t is
The margin of error in the poll was reported as 6 percentage points (with a 95% degree of confidence). Which statement is correct?
At 0.01 level of significance, is there evidence that mean price is higher at Whole Foods Market than at Fairyway supermarket? Interpret the meaning of p-value in (i).
Suppose that 245 such companies are selected independently and at random. What is the probability that 191 companies in the sample electronically monitor their employees?
A random variable X that has pmf given by p(x) = 1/ (n+1) over the range Rx = {0,1,2,...,n} is said to have a discrete uniform distribution. Find the mean and variance of this distribution.
Set up hypotheses and carry out all relevant tests. Describe all results and implications which you have discovered.
Assume the condition of Normality is met for the problem below. I also want to know the following elements: (Please do not use the Student t test, nor a Chi-square test) Two-tailed test ok?
What is the probability over the course of a twelve hour shift that there will be at least one hour in which follow-up is not timely?
Would a normal model be appropriate to describe the distribution of sale prices?
Test at 1% significance level that there exists a difference in proportion between men and women drivers who always use seat belts.
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