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1. In an experiment comparing a new long-distance golf ball with the conventional design, each of 20 golfers hits one drive with each ball. The average golfer in the sample hit the new ball 9.3 yards farther, with a standard deviation of 10.5 yards. At the 0.005 level, evaluate the effectiveness of the new ball in increasing distance. Using the appropriate statistical table, what is the approximate p-value for this test?
2. The idling speed of 14 gasoline-powered genera- tors is measured with and without an oil additive that is designed to lower friction. With the additive installed, the mean change in speed was 123 revolutions per minute (rpm), with a standard deviation of 3.5 rpm. At the 0.05 level of significance, is the additive effective in increasing engine rpm?
Students will conduct one brief research exercise that will be written up as a research report using APA style.
A certain airplane has two independent alternators to provide electrical power. The probability that a given alternator will fail on a 1-hour flight is .02. What is the probability that:
The probability that a randomly selected elementary or secondary school teacher from a city is female is 0.68, holds a second job is 0.38, and is female and holds a second job is 0.29.
Suppose a shock causes a unit damage to the machine with probability 0.1 and no damage with probability of 0.9. Successive shocks are independent. Suppose the damages are cumulative and the machine can withstand at most four units of damage. (That..
please help the question. thank youa survey organization wants to take an srs in order to estimate the proportion of
Problem 1: Using the following data, prepare a run chart, scatter chart, and control chart. A late surgery is defined as any surgical operation that was started more than 30 minutes after its scheduled time (Table).
Estimate the population proportion p of commuters from the two islands who would prefer the ferry service. Construct a 95% confidence interval for p.
at a certain university the average attendance at basketball games has been 2825. this year the attendance for the
The entire shipment is accepted if only one or non of the tablets is defective. If the defect rate is 5% then what is the probability that the shipment will be accepted?
What is the equation for this regression model?
For a random sample of 12 observations, the sample mean was 407 and the sample standard deviation 6. Using the .01 significance level: State the decision rule.
A person decides to take a telephone survey of 40 families in the 721-exchange area (sometimes referred to as prefix). You want an excellent representation of all subscribers in the exchange area.
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