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Suppose IQ scores were obtained from randomly selected siblings. For 20 such pairs of people, the linear correlation coefficient is 0.936 and the equation of the regression line is Y^=-22.06+1.23x,
At a batter testing facility, if at least 2 of the 20 batteries tested indicate low voltage, the entire lot will be rejected. Find the probability that a lot will be rejected if 8% of the batteries
The machine that fills bottles is fairly precise. The distribution of the number of ounces of water in the bottles is normal with a standard deviation of 0.06 ounces. The mean is supposed to be 16 o
Scores are normally distributed with a mean of 100 and a standard deveiation of 15. The graph is right side 0.6 , i need the indicated iq score x.
If this branch of military changes the height requirements so that all women are eligable except the shortest 1% and the tallest 2% what would the new height requirements be. The % of women who meet
Consider a hypohesis test that uses a 0.05 significance level to test the claim that the mean weight of all jellybeans is equal to 0.8575 g (the weight necessary so that bags of jellybeas have the w
If np >5 and nq>5, estimate P(more than 5) with n=13 and p=0.7 by using the normal distribution ; if np<5 or nq<5, then state the normal approximation is not suitable. P(more than 5)= pl
The number of gallons of paint that Home Depot sells in a given day is normally distributed with a mean of 230 gallons and a standard deviation of 28 gallons (I realize that the distribution is prob
What is the expected number of tosses until the pattern HT appears for the first time? Hint: break this calculation into 2 pieces: the expected amount of time you have to wait until H appears, and t
Is there a linear correlation between chest size and weight? What proportion of the variation in weight can be explained by the linear relationship bwteen weight and chest size? ( round to three dec
For the following claim, find the null and alternative hypothesis, test statistic, P-value, critical value, and draw a conclusion. Assume that a simple random sample has been selected from a normall
Find the unconditional mean and variance of Y. Find the marginal distribution of Y . One way is via the MGF. Find Cov(mean, Y ).
A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 290 babies were born, and 261 of them were girls. Use the sample data to construct a 99% confi
Before 1918, approximately 60% of the wolves in the New Mexico and Arizona region were male, and 40% were female. However, cattle ranchers in this area have made a determined effort to exterminate w
You get to choose between two envelopes, each of which contains a check for some positive amount of money. Unlike in the two-envelope paradox, it is not given that one envelope contains twice as muc
You toss a fair coin repeatedly until some event happens. What is the expected number of tosses until the pattern HT appears for the first time?
Is the extra expense of coaching helpful in gaining admission to college? Please explain your answer on a separate piece of paper. (You only have one try for this question.)
What conditionns or assumptions must be considered before doing any inference procedures? Find a 99% confidence interval for the difference in mean number of repairs made. You do not need to interpret
Good machines are expected to produce no more than 1% defective products. After he evaluates 540 shoelaces, and finds that 17 are defective. If Dilbert has to report a confidence interval with a mar
The national Academy of science reported in a 1997 study that 40% of research in mathematics is published by U.S.authors. The mathematics chairperson of a prestigious university wishes to test the c
Test Statistic and Value: P-Value: Conclusion: Label the test statistic you found (t-value, z calue, or Chi square) and the value. For the conclusion please state fail to reject or reject the null h
A toll bridge charges $1.00 for passenger cars and $2.75 for other vehicles. Suppose that during daytime hours, 60% of all vehicles are passenger cars. If 15 vehicles cross the bridge during a parti
What can you expect his average sales to be for the month?
In testing a certain kind of truck tire over a rugged terrain it is found that 25% of the trucks fail to complete the test run without a blowout. Of the next 15 trucks tested, find the probability t