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Data are collected on the relationship between the number of hours per week practicing a musical instrument and scores on a math test. The line of best fit is as follows: y = 72.5 + 2.8x.
What would you predict the score on a math test would be for a student who practices a musical instrument for 11.5 hours a week? Round to one decimal place.
1. The National Center for Health Statistics reports the following age breakdown of deaths in the United States during 2006. Source: The New York Times Almanac 2009, p. 392.
A chemical reaction is run in which the usual yield is 70%. A new process has been devised that should improve the yield.
James Burke claims that about 70% of all single men would welcome a women taking the initiative in asking for a date. A random sample of 20 single men were asked if they would welcome a women taking the initiative in asking for a date.
Does the use of inhaled steroids by children affect their height as adults? Excerpts from the abstract of a study about this are given.
With this important detail, are there any significant differences with LSD?
a. Use 2004 as the base year to form a simple price index for tuition. b. Use 2007 as the base year to form a simple price index for tuition.
What is the main principle behind analysis of variance? Explain the sum-of-squares principle.
Let's treat race of offenders as the independent variable and race of victims as the dependent variable. If we first ignore the independent variable and try to predict race of victim, how many errors will we make?
Individual scores of a placement examination are normally distributed with a mean of 84.2 and a standard deviation of 12.8.
A research concludes that the number of hours of exercise per week for adults is normally distributed with a mean of 4 hours and a standard deviation of 2.5.
(a) What is the distribution of the number of times this event occurs in 20 (b) Calculate the probability that the event occurs five times.
Bill has just started working for a major grocery store as a check-out clerk. Mason is training him in the duties of the new position. At the end of the first day, Bill and Mason are counting the cash in their drawer and reconciling cash receipts ..
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