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Indy 31.4 is a radio station that plays music 24 hours a day, 7 days a week. They have edited every song they play so that the duration of the song is exactly 3 minutes.
A researcher would like to evaluate the effectiveness of a pain-relief patch designed for lower back pain. Prior to testing the patch, each of n = 8 patients rates the current level of back
Which of the following describes the effect of increasing sample size? Measures of effect size and the likelihood of rejecting the null hypothesis both increase.
What is indicated by a large variance for a sample of difference scores?
Out of a sample of 94 purchases at the drive-up window of a fast-food establishment, 27 were made with a major credit card. Estimate the proportion of sales made with a credit card.
Treating these data as a random sample for the population of all possible damage-only policies that could be issued, find a 95% confidence interval for the proportion of at least one claim.
Suppose that n units are randomly sampled and x number of the sampled units are found to have the characteristic of interest. In each case, (i) define p in the context of the problem, (ii) provide a
It has been reported that men are more likely than women to participate in online auctions. In a recent survey, 65% of respondents reported that they had participated in an online auction. In this s
The lifetime of a randomly chosen battery in a certain application is modeled by a normal distribution with mean µ = 16 hours and standard deviation ? = 2 hours. Give one reason why the normal
The economy may be headed for recession. As the manager of a bank, you would like to know the average income of the bank's credit card customers. A sample of 100 randomly selected customers yields a
You have learned some of the basic terminology of statistics. Please propose a study and write a description of the study no more than two pages. Below is a tentative guideline for the paper.
Assume the projects are statistically independent of one another. If you choose to invest $1M in each of the five projects, what is the probability of making money on the five projects as a whole?
Suppose a random sample of n = 60 adults are polled and asked if they believed that recycling made the biggest difference in protecting our environment. Let us assume that the 78% figure is, in fact
Assume that the distribution of score is normal with the mean and SD given. what are the first and third Q of the distribution and compare it to the actual value of Q1: 420 and Q3: 570. Dose this gi
What would be the three chance (common) causes of variation for this process? What would be for assignable (special) causes of variation for this process?
For a normal distribution that has a mean of 100, and a standard deviation of 8,determine the Z-score for each of the following X values: X= 108, X = 112, X = 98, X = 70, X = 124
It is found that when a particular 4-sided die is rolled a 1 occurs 26.9% of the time, a 2 occurs 23.8% of the time, a 3 occurs 24.2% of the time, and a 4 occurs 25.1% of the time.
A student, asked to give a class demonstration of the use of an ordinary t-statistic confidence interval for comparing two means in a single factor study with 5 levels, proposed to construct a 99% c
a) Assuming that pairwise comparisons of the treatment means are to be made with a 90 perecent family confidence coefficient, find the widths of the Tukey, Scheffe, and Bonferroni procedure for
Sokal and rohlf 1981 studied purebred Canadian dairy cattle. The butterfat percentages from 2-year-old cows follow a normal distribution with a mean of 4.51 and a standard deviation of 0.348.
For a particular brand of seed, on the average 10% of the seeds do not germinate. Find the probability distribution for a sample of 50 seeds.
Wasserman and wadsworth 1989 discuss a process for the manufacture of steel bolts that continuously feed an assembly line downstream. Historically, the thickness of these bolts follow a normal distr
Suppose that replacement times for washing machines are normally distributed with a mean of 9.3 years and a standard deviation of 1.1 years. Find the probability that 70 randomly selected washing ma
A standard deck of cards contains 52 cards. One card is randomly selected from the deck. A. Compute the probability of randomly selecting a two or three from a deck of cards.
Suppose that you improve the process so that the occurrence rate of defects is cut in half to l = 0.01. What effect does this have on the prob- ability that an assembly will have one or more defects