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Suppose bolts are being manufactured using a process so that it is known that the length of the bolts follows a normal distribution with standard deviation 50 mm. The manufacturer wants to check that the mean length of their bolts is 160 mm, and so takes a sample of 50 bolts and uses a one tail test with ? = .01 (i.e. H0: µ ? 160). What is the probability of a type II error if the actual mean length is 162.5?. Draw the power curve.
Suppose a survey item asks someone if something is very important, somewhat important, not very important, or unimportant. This is an example of what level of measurement?
If 30% of the athletes have been disqualified in previous terms, what is the probability that a randomly selected athlete will be disqualified during the next grading period?
At a party there are 30 students over age 21 and 20 students under age 21. You choose at random 3 of those over 21 and separately choose at random 2 of those under 21 to interview about attitudes toward alcohol.
compute the correlation coefficient for the data below to the thousandths place please show workx values-2-103y
the length of time in seconds that a user views a page on a web site before moving to another page is a lognormal
State the hypotheses. (b) State the decision rule and sketch it. (c) Find the test statistic. (d) Make a decision. (e) Estimate the p-value and interpret it. HeartRate.
Why would you choose this measure of central tendency? What circumstances would make you choose an alternative measure?
Using an appropriate graphical display, describe the relationship between DNA and phytopigments and fit a regression line to the data. Write down the equation of the model and interpret all parameters in the model.
Assume that a hypothesis test of the given claim will be conducted. The college Dean of Admissions claims that the times students require to earn a bachelors degree have a mean less than five years. Which equality/inequality (e.g., =, =
The president of Doerman Distributors, Inc., believes that 34% of the firm's orders come from first-time customers. A simple random sample of 120 orders will be used to estimate the proportion of first-time customers
find the mean variance and standard deviation of the binomial distribution with the given values of n and p.n90
Proportion of college students who prefer drink A: (0.384, 0.424). Identify the point estimate for estimating the true proportion of college students who prefer that drink.
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