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Question: 1. List the four topics that determine the power of an experiment. [If you can recall them without looking at the text, you know that you have been reading actively (and effectively).]
2. What is the effect of set (previous experience) on problem solving? In a classic experiment by Birch and Rabinowitz (1951), the problem was to tie together two strings (A and B in the illustration) that were suspended from the ceiling. The solution to the problem is to tie a weight to string A, swing it out, and then catch it on the return. The researcher supplied the weight (an electrical light switch) under one of two conditions. In one condition, participants had wired the switch into an electrical circuit and used it to turn on a light. In the other condition, participants had no experience with the switch. Does education (wiring experience) have an effect on the time required to solve the problem? State the null hypothesis, analyze the data in the accompanying table with a t test and an effect size index, and write a conclusion.
Wired the switch into circuit No previous experience with switch
X¯ 7.40 minutes 5.05 miniutes
s^ 2.13 minutes 2.31 miniutes
N 20 20
The distance travelled (in km) by a courier service motorcycle on 40 trips were recorded by the driver. Define the random variable and the data type.
Problem: A manufacturer of biscuits produces 3 times as many cream ones as chocolate ones. Biscuits are chosen randomly and packed into boxes of 10. Find the probability that a box contains equal numbers of cream biscuits and chocolate biscuits.
Estimate the IQR of the tires tread life - If the dealer is only willing to give a refund to no more 2% of the customers, for what mileage can he guarantee these tires to last?
The following data represent the number of weed-eaters sold per month at a local garden shop and their prices
First-year students. A UCLA survey of college freshmen in the 2006- 2007 academic year found that 28.6% of all first-year college students identify themselves.
Then, select a manufacturing or service process and the data to be measured for that process; for example, the dimensions of the product, or the transaction times. Discuss at least 5 potential special causes of variation in the data.
A messenger service employs eight men and nine women. Every day, the assignments of errands are supposed to be done at random.
a research team conducted a study showing that approximately 25 of all businessmen who wear ties wear them so tightly
Table shows the smoking habits of group college students. If student is selected at random, determine the probability of getting someone who is man or a woman.
What are accruals? Provide examples of accruals. Why do accruals require adjusting entries? What types of accounts are debited and credited in an unearned revenue adjusting entry?
Test scores on a university admissions test are normally distributed, with a mean of 500 and a standard deviation of 100. a) What is the probability that a randomly selected applicant scores between 425 and 575?
For the following data, verify that you do not reject with the ANOVA F testing with α = .05, but you do reject with Welch's test.- What might explain the discrepancy between the two methods?
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