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You are doing a study examining the effects of studying method on academic achievement. All the students in your study take a course on genetics that lasts for 10 days. One group of students studies 20 minutes a day for 10 days. The second group studies once at the end of the course but for 200 minutes.
What is a one-tailed test? What is a two-tailed test? Explain at least three differences between one- and two-tailed tests.
State a hypothesis related to this study that would cause you to conduct a one-tailed test. State a hypothesis related to this study that would cause you to conduct a two-tailed test.
Determination of Nominal, Ordinal, Interval, Ratio.Temperature is an example of what level of measurement.
A well-established power-drink dispensing machine is programmed to dispense an average of 2.02 liters into a container labled"2 liters". Actual quantities are known to be normally distributed with a standard deviation of 0.015 liters. What is the ..
In an ABCNews.com nationwide poll done in 2001, the proportion of respondents who thought that it should be illegal to use a hand held cell phone while driving a car was 69 %. The poll's sample was 1027.
Construct a 90% confidence interval for the true mean weight. What sample size would be necessary to estimate the true weight with an error of plus or minus .03 grams with a 90% confidence?
I tossed a coin 6 times and recorded the outcomes - H for heads and T for tails. The first set of tosses yielded HTHTTH and the second set of tosses yielded TTTHHH. Which set of tosses is more probable to happen? And why?
A sample from a population with μ = 40 and =σ10 has a mean of m = 44. if the sample mean corresponds to a z = 2.00, then how many scores are in the sample?
Find the alternative would be chosen according to expected value and utility.
Sixty-four students in an introductory college economics class were asked how many credits they had earned in college, and how certain they were about their choice of major.
Find out the area using Normal distribution. As, if Z is a standard normal variable find out the probability that Z lies.
A survey of 800 women shoppers found that 17% of them shop on impulse. What is the 98% confidence interval for the true proportion of women shoppers who shop on impulse?
Super Markets, Inc. is considering expanding into the Scottsdale, Arizona, area. Ms. Luann Miller, Director of Planning, must present an analysis of the proposed expansion to the operating committee of the board of directors.
In the sample of 80 students, 9 were found to be overweight. At a= 0.01, is there adequate evidence to reject claim using critical values?
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