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A half-liter bottle of soft drink is supposed to contain a mean of 520 ml. The filling process follows a normal distribution with a known process standard deviation of 4 ml.
(a) Which sampling distribution would you use if random samples of 10 bottles are to be weighed? Why?
(b) Set up hypotheses and a two-tailed decision rule for the correct mean using the 5 percent level of significance.
(c) If a sample of 16 bottles shows a mean fill of 515 ml, does this contradict the hypothesis that the true mean is 520 ml?
The average number of television sets in the sample households turns out to be 1.86, and the SD is 0.86. Find a 95% confidence interval for the average number of television sets per household.
Are there any statistically significant differences in baseline characteristics between treatment groups? Justify your answer. Write the hypotheses and the test statistic used to compare ages between groups. (No calculations - just H 0 , H 1 and for..
Sun Microsystems has approximately 50% of the high-end Unix machines market with its closest competitor being IBM. Suppose that 15 firms were in the market to purchase a high-end Unix machine. Assume that these firms listened to sales pitches by a..
Adriana Corporation manufactures football equipment. In planning for next year, the managers want to understand the relation between activity and overhead costs.
Sample data in a goodness-of-fit test are compared with __________. A. a predetermined or historical standard for the variable being studied
For its validity, all hypothesis testing depends heavily on the assumption that the sample that is used was drawn using probability sampling techniques.
Find the probability that he will answer all 10 questions correctly.
Assume that increasing and decreasing allergic reactions are equally likely if the training has no effect. Use alpha = .05
Describe a problem (real or fictitious) for which it will be appropriate to utilize a hypothesis test. Describe how data will be collected, sample size, assumptions, level of measurement etc.
At the significance level 0.01 is there sufficient evidence to conclude that a difference exists in the mean time required for the elimination of the rash?
A bank's loan officer rates applicants for credit. The ratings can be described by a Normal model with a mean of 200 and a standard deviation of 50.
The first step in this assignment is to provide SPSS with the Value Labels for the values in LOCALE97.
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