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Question: A professor gave his general psychology class a 50-item true/false test on the first day of class to measure the students' beliefs about punishment, reward, mental breakdowns, and so forth-topics that would be covered during the course. Many items were phrased to represent a common misconception ("mental breakdowns are usually caused by defective genes"). At the end of the course, the same test was given again. High scores mean lots of misconceptions. Analyze the data and write a conclusion about the effect of the course on misconceptions.
What is the sample proportion? What is the mean of the sampling distribution? What is the standard error of the sampling distribution?
Compute the probability of seven consecutive points falling above the centerline given a stable process. Is this probability associated with type I or type II error?
Given the following data for a two-way ANOVA, identify the sets of null and alternative hypotheses, then use the 0.05 level in testing each null hypothesis.
The data in Table 22.1 is a record of the measurements determined over the ?rst hour of a shift. Obtain an X-bar chart and identify whether or not the manufacturing process is "in-control".
The college of business at a state university has a computer literacy requirement for all graduates. Students must show proficiency with a computer spreadsheet.
Use simple exponential smoothing with α = 0.33 to forecast battery sales for February through May. Assume that the forecast for January was for 22 set of tires.
A random sample of five observations from the first sample resulted in a standard deviation of (12). A random sample of seven observations from the second sample gave a standard deviation of (7) at the (.01) significance level.
Explain the meaning of the variance of a random variable. What are possible uses of the variance?- Why is the standard deviation of a random variable more meaningful than its variance for interpretation purposes?
Verify that P(x) is a probability distribution.- Find the cumulative distribution function.- Find the probability that at most four additional hours are slept.
An important area of biochemical medical research is in the development of antitumor drugs, where interest lies in being able to predict a drug's activity using properties of its chemical structure. Since the resultant biological measures poss..
Below you are given a partial computer output based on a sample of 21 observations, relating an independent variable (x) and a dependent variable (y).
Burnwood Tech plans to issue some $60 par preferred stock with a 6% dividend. A similar stock is selling on the market for $70. Burnwood must pay flotation costs of 5% of the issue price.
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