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Wine Spectator rates wines on a point scale of 0 to 100. It can be inferred from the many ratings in this magazine that the average rating is 87 and the standard deviation is 3 points. Wine ratings seem to follow a normal distribution.
In the May 15, 2007, issue of the magazine, the burgudy Domaine des Perdrix received a rating of 89.2 What is the probability that a randomly chosen wine will score this high or higher?
find that probability that 10 or more of the 30 individuals entering the store in a given hour will decide to make a purchase.
Find the third quartile Q3 of the list of 24 sorted values shown below. Which is relatively better: a score of 81 on a psychology test or a score of 50 on a economics test? Scores on the psychology test have a mean of 88 and a standard deviation of..
1. (a) Suppose we construct a 99% con?dence interval. What are we 99% con?dent about? (b) Which of the con?dence intervals is wider, 90% or 99%? (c) In computing a con?dence interval, when do you use the t-distribution and when do you use z, with nor..
Calculate the least squares estimate of and What's the first row, second column entry of ? (Round to the nearest fourth decimal)
The accompanying two-way frequency table appears in the article "Marijuana Use in College" (Youth and Society, 1979: 323-334). Each of 445 college students was classified according to both frequency of marijuana use and parental use of alcohol and..
What is the margin of error for a 95% confidence interval on the true proportion of men who still live with their parents? (Keep all computations accurate to four decimal places.)
The changing ecology of the swamps in Louisiana has been the subject of much environmental research. One water-quality parameter of concern is the total phosphorous level.
Determine if your survey questions are appropriate for researching your business problem, and explain why they are. Identify the level of measurement being used for each of your survey questions.
what value is expected on average for the f-ratio in anova when the null hypothesis is true. explain why this value is
find the value of t for the difference between two means based on an assumption of normality and this information about
A small water proof electric motor is being tested. The motor is in a container with some ice and water, which are initially in equilibrium.
Out of 120 students who took a general education math quiz, 98 passed. What percentage of the students passed
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