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1. Students often incorrectly believe that inference for a population proportion based on the sample proportion is always valid if n > 30. They are confusing a general rule of thumb for the Central Limit Theorem which says that as the sample size, n, gets large becomes Normally distributed with a different rule for proportions. The correct rule for proportions is that we can create confidence intervals for p based on if
A. n is at least 10.B. there are at least 15 successes and 15 failures.C. np = 5 and n(1 - p) = 5.
2. A sample of 75 students found that 55 of them had cell phones. The margin of error for a 95% confidence interval estimate for the proportion of all students with cell phones is
A. 0.084.B. (0.633, 0.833).C. 0.100.
Find the mean for the random variable X, the number of students who work full time in sample of size 16. Please round your answer to two decimal places.
She knows that each order for these bills costs $300 for clerical and armored car delivery costs, and that order lead time is six days. Assuming a thirty-day month, if she were to order 6,000 bills at a time, what would be the length of an order cy..
Find the probability that among 8 randomly selected graduates, at least one finds a job in his or her chosen field within a year of graduating.
A rental agent claims that the mean monthly rent, mu, for apartments on the east side of town is less than $725. A random sample of 13 monthly rents for apartments on the east side has a mean of $724
If there are 20 people in the room, 12 men and 8 women, what is the probability of picking two people, without replacement, getting a woman on the first and a man on the second?
State the null hypothesis and the alternate hypothesis. State the significance level. State the decision rule. Give the formula for the test statistic.
1.experiments on learning in animals sometimes measure how long a laboratory rat takes to find its way through a maze.
A subject is just guessing has probability .25 of guessing correctly on each card. What is the probability of exactly 5 correct guesses?
The assembly time for a product is uniformly distributed between 6 to 10 minutes.
The instructor has "covered" Autocorrelation Function (ACF) and Partial Autocorrelation Function (PACF), but I have not yet grasped a full understanding.
Proportion of out-of-tolerance items is greater than 0.02, the robot will be overhauled. Otherwise it will be allowed to continue operating. What is the probability that a satisfactory robot will be overhauled unnecessarily?
Determine the largest village in terms of the population?
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