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A teacher wants to know if students in her biology class did significantly better on an exam after instruction using authentic learning. The scores pre and post test are listed below. Based on an α = .05, what can the teacher conclude?
Pretest:77 79 81 88 67 90 73 82 85 76 71 70
Posttest:80 81 87 89 72 95 77 88 83 79 72 75
Sampling seventy-two percent of americans squeeze their toothpaste tube from the top. This and other not so serious finding are included in The first really important survey of american habits.
A researcher is evaluating the influence of a treatment using a sample selected from a normally distributed population with a mean of µ = 80 and a standard deviation of σ = 20. The researcher expects a 12 point treatment effect and plans to use a ..
Show some work for each part. A diagram can be helpful. A survey of adults found the following: 65 percent of the adults drink coffee. 35 percent drink tea. 80 percent drink coffee or tea (or both). If we choose a surveyed adult at random, find t..
State the null and alternative hypothesis if the average electric bill for residents of White Pine Estates exceeds $52.98 per month.
If an urn is selected at random and a ball is drawn, find the probability it will be red.
What is the null and alternative hypothesis? What is your final conclusion?
At.05 significance level, is there a difference in mean number of calls per day between 2 employees? Compute the p -value?
Which of these variables are discrete and which are continuous random variables?
According to the Sleep Foundation, the average night's sleep is 6.8 hours. Assume the standard deviation is 0.6 hours and the probability distribution is normal. a. What is the probability that a randomly selected person sleeps more than 8 hours?
What information is provided by the numeral value of the Pearson correlation? What is the major distinction between the Pearson and Spear man correlations?
In, addition, the company has decided to purchase at least three of the new Econo-Tankers for use on short-run, low-demand routes. As a final constraint, the conpany deos not want more than half the new models to be Super Tankers.
Critically discuss the auto-covariance function of a stationary time series and its basic properties.
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