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The median annual income of subscribers to Barron's magazine is $131,000 (barrons-mag.com, July 28, 2000). Assume a sample of 300 subscribers to The Wall Street Journal found 165 subscribers with an income over $131,000 and 135 subscribers with an income under $131,000. Can you conclude that there is any difference between the median incomes of the two subscriber groups? At α .05, what is your conclusion?
Does this interval estimate suggest that there has been a change in the proportion of students who graduate within four years? Why or why not?
An insurance company is trying to determine if there is a significant difference in the average number of sick days that registered nurses and nurse practitioners use per year. The data analysis provided the following output.
Identify the critical points and determine their nature (local max, local min, saddle, degenerate) using the Hessian of teh function f(x,y,z) = x^2+y^2+2z^2+xz
The Absent Minded Professor study was a RCT, which had an objective to estimate the protective effect of drug "No-Reminder" compared to drug "Reminder" on risk of "Forgetful syndrome". The study found that the drug "No-Reminder" was protective.
The average salary of senior managers in the construction industry is $180,000 per year. Suppose we would like to take a sample of senior managers at a newly established company XYZ to see whether the mean annual salary is different from that ..
a simple random sample of 40 salaries of ncaa football coaches has a mean of 415953 and a standard deviation of
the smoking rate for the entire u.s. population of adults is 32 national institute on drug abuse. suppose that for a
Determine the probability that a sample proportion for n=30 is within 0.10 of the true population proportion of 0.40, which represents the proportion of cola drinkers who prefer a Coca-Cola drink.
Table 7.17 is from a General Social Survey. White subjects in the sample were asked: (B) Do you favor busing (Negro/Black) and white school children from one school district to another?, (P) If your party nominated a (Negro/Black) for President, w..
from these data estimate the average height of all adults and calculate a bound on the error of estimation assume that
Let E denote the event that the ?rst airline's ?ight is fully booked on a particular day, and let F denote the event that the second airline's ?ight is fully booked on that same day. Suppose that P(E) = .7, P(F) = .6, and P1E ¨ F 2 = .54. Calcu..
a standard slot machine has three reels. the first reel has 3 walnuts 7 cherries 3 oranges 5 lemons 1 bell and 1
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