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X = Viscosity of a polymer with Catalyst A was measured for 22 samples with resulted in sample average of 742 and standard deviation of 26. Independently, Y = viscosity of another polymer with Catal
Create an appropriate 95% confidence interval to test if the average retrieval time differs per group. To receive full credit, state the null/alternative pair, statistical decision based on the conf
Using the one- sided Chebyshev inequality, how many fish need we plan on catching so as to be at least 90 percent certain of obtaining at least one of each type?
Can you conclude that people become more politically conservative as they get older? Why or why not? Propose alternative ways of studying this topic.
Advocates of this policy claim that the activity encourages pleasure reading outside the required silent reading time. Design a nonequivalent control group pretest-posttest quasi-experiment to test
We want to test to determine if there has been a significant increase in the average yearly income of attorneys. Provide the null and the alternative hypotheses. Compute the test statistic.
Give the null and alternative hypotheses, Calculate the test statistic, and 3. give the conclusion (including a comparison to alpha or the critical value)
A student encounters an animal embryo at the eight-cell stage. The four smaller cells that comprise one hemisphere of the embryo seem to be rotated 45 degrees and lie in the grooves between larger,
Pens are sold in packets of 15 pens per packet. The pens are of different colour and 20% are red. Show the the probabilty of a randomly chosen packet of pens containing 3 or more red ones is 0.602
If appropiate, use the information to calcualte and interpret a 95% confidence interval for the mean age of students at the time they take the comprehensive exam for all students enrolled in graduat
A fair 4 sided die has the numbers 1,2,3 and 4 on its faces. The die is rolled 20 times. The random variable X represents the number of 4s obtained. Find the mean and variance of X
An experimenter wants to conduct a hypothesis test on a claim that there was no difference between two population means. That is, H0: ?1 - ?2 = 0. The experimenter randomly selected 10 items from th
Suppose that the selling price of the above compound depends on the alcohol contents. Specifcally, if 1/3 < X < 2/3, the compound sells for 120 dollars/gallon otherwise it sells for 90 dollars
The Snappy Service gas station manager is thinking about a promotion that she hopes will bring in more business to the full service island. She is considering the option that when a customer request
What proportion of the time is he up because of his dog? What proportion of the time does he actually spend sleeping
A manufacturer claims that its televisions have an average lifetime of at least five years (60 months) with a population standard deviation of seven months. Eighty-one televisions were selected at r
Suppose you know that the distribution of sample proportions of the residents of one town over 70 years old in samples of 110 residents is normal with a mean of 0.12 and a standard deviation of 0.03
Construct a Laspeyers index using 1988 as a base year. What are the disadvantages of thus type of index? Construct a Paasche index using 1988 as a reference base year. What are the disadvantages of th
The average magnesium concentration in ground water around Metro City is u=65.6 parts per million(ppm) with a standard deviation of o=10. The table below shows the ground-water magnesium concentrati
The annual cost of storing each item is estimated at 80 cents in interest expense, .08*$10 = $.80, plus 70 cents in warehouse expense per unit per year, or $1.50 total holding costs. Demand is assum
A research team conducted a study showing that approximately 25% of all businessmen who wear ties wear them so tightly that they actually reduce blood flow to the brain, diminishing cerebral functio
Among a random sample of 150 employees of a particular company, the mean commute distance is 25.5 miles. This mean lies 1.2 standard deviation(s) below the mean of the sampling distribution. If a se
Compute the stock-price index for the overseas trading inc. using the weighted arithmetic mean of relatives index with October 4 = 100, using base-period weights. Compute a price index by the weight
Given the following demand schedule for newspapers, find the optimal order size if papers cost the newsboy $.50 and he can sell them for $1.50 each.
Which of the following statement are false about the chi-suared distribution with v (specific value)degrees of freedom?