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A standardized productivity scale has a μ = 25 and a σ = 5. The CEO of the company wants to know if employee participation in company decisions has an effect on productivity. A sample of n = 75 employees participated in the decision-making process was administered the productivity scale with a resulting mean of 27. Does participation in company decisions have an effect on productivity? Use α = 0.01
How does a researcher determine the meaning of a score on a norm-referenced test such as an IQ test? Why are raw scores transformed to standardized scores, such as z-scores, in order to interpret those raw scores?
A direct-drive arm is an innovative mechanical arm in which no reducers are used between motors and their loads. Because the motor rotors are directly coupled to the loads, the drive systems have no backlash, small friction, and high mechanical st..
question 1to test the efficacy of admissions or release an emergency room embarks on a controlled experiment. each
A random sample of 15 snow mobiles was selected, and the lifetime (in months) of the batteries was measured. The variance of the sample was 8.6. Find the 90% confidence interval of the true variance and standard deviation.
Sketch a cumulative relative frequency polygon (an Ogive) for these data. Show all workings and the sketch in your answer booklet. Don't forget to label all axes and include an informative title.
Note that if only a single batch of pulp was produced under each preparation method and split into 12 sub-batches for the cooking factor, this would be an example of pseudo-replication. Why?
the bureau of the census reports that the average commuting time for citizens of both baltimore maryland and miami
A business trip is equally likely to take 2, 3, or 4 days. After a d-day trip, the change in the traveler's weight, measured as an integer number of pounds, is uniformly distributed between -d and d pounds. For one such trip, denote the number of..
a company produces bolts for large-scale construction projects. the shear strength x of the bolts is assumed to be a
at a track and field tournament freds long jumps vary evenly from 6.5 to 7.2 meters. let x be the length of freds long
Suppose that, on average, in every two pages of a book there is one typographical error, and that the number of typographical errors on a single page of the book is a Poisson r.v. with λ = 1/2. What is the probability of at least one error on a ce..
Scientist does n ot believe that water ph is 7. She wants to test the null hypothesis that the true level of ph is 7 at the .05 significance level. Her alternative hypothesis is that the water does not have a ph of 7. Which p-value will she reject..
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