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Assume that the number of customers who enter a supermarket each hour is normally distributed with the mean of 620 and a standard deviation of 170.
The cards in the standard deck of 52 have 13 different ranks, with ace=1, jack=11, queen=12, and king=13. You draw three cards from a deck in succession. What is the probability that the rank of ea
The alternative hypothesis is that the mean difference between the performance of the candidates is not zero. Conduct the appropriate analysis. Should H0 be rejected? What should the researcher conclu
Assume that a study has shown that 0.5% of all items checked through supermarket scanners are given the wrong price. What proportion of the time that at least one item is incorrectly priced when 18
Using the notion of complexity as well as a box model, discuss why we have a regression effect.
For a set of data with mean 18 as well as variance 36, approximately 68% of the values will fall between 6 to 30.
One coin in the collection of 25 has two heads (both sides are heads). The rest are fair (one H and one T). A coin is selected at random from the lot as well as tossed. It turns up heads six times i
The distribution of annual returns on common stocks is roughly symmetric. What sample mean annual return (sample mean for the next 40 years before Andrew retires) would be higher than 80% of all sam
In a study evaluating the effectiveness of the new medication designed to control high blood pressure, one sample of individuals is given the medicine and a second sample is given an inactive placeb
A company had 80 employees whose salaries are summarized in the frequency distribution below. Find out the standard deviation. Find out the standard deviation of the data summarized in the given fre
A teacher gave the reading test to a class of 5th grade students as well as computed the mean, median and mode for the test scores. Which of the following statements can't be an accurate description
Considering the distribution of calculates on a hard exam, you would expect to find out the greatest density of scores.
Determine the shape of the distribution for the following set of scores?
Given the following frequency distribution, find out the mean, variance, as well as standard deviation. Please show all work.
A researcher reports that the size of effect in some population is d = 0.88. Which of the following is a suitable interpretation for d?
If 5 points were added to every score in the population, what would the novel values be for the mean and standard deviation?
A researcher gets z = 2.04 for a one-independent sample z-test. What is the decision for this test at a .05 level of significance?
On an exam with a mean of m=70, you have a score of X=65. Which of the following values for the standard deviation would give you the highest position within the class?
US dept of agriculture claims that the mean consumption of bottled water by the person in the US is 28.5 gallons per year. A random sample of 100 people in the US has a mean bottled water consumptio
Given the following values: = 6.0, M = 7.6, n = 36, = 6, carry out a one-independent sample z-test at a .05 level of significance. For a one-tailed test, upper-tail critical, what is the decision?
A researcher calculates a test statistic and finds that the p value for this test is .03. What does this result mean?
A randomly chosen bulb is observed to be still working after 135 hours. Find out the conditional probability that the bulb will blow in the next 60 hours.
Assume that a certain college class contains 65 students of these, 35 are seniors, 37 are economic majors, and 7 are neither A student is chosen at random from the class. Determine the probability t
The number of arrivals at the gallery is Poisson distribution with the average of 4.5 people per hour.
A newspaper determines that the mean number of typographical errors per page is four. Compute the probability that at most three typographical errors are found on a page.