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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?
which of the following is considered a decision variable in the media selection problem of minimizing interview costs
Thomas is going to make an open-top box by cutting equal squares from the four corners of an 11 inch by 14 inch sheet of cardboard and folding up the sides.
Find the proportion of all graduate students at this university with an undergraduate major in mathematics at the 90% confidence level.
when a survey calls residential telephone numbers at random only 25 of the calls reach a live person. you watch the
Find the probability (type answer as an integer or simplified fraction) of a couple having a baby boy when their fifth child is born, given that the first four children were all boys.
The lifetime of zzz batteries are normally distributed with a mean of 270 hours and a standard deviation of 10n hours. Find the number of hours that represent the 40 th percentile.
An electrical firm manufactures light bulbs that have a length of life that is approximately normally distributed. If a sample of 16 bulbs has an average life of 50 hours and the population standard deviation is known to be 10 hours.
What is the probability that One member of the committee lives in northern Kentucky and the others live in Ohio and At least 1 member of the committee lives in northern Kentucky?
it is estimated that 0.5 of the callers to the customer service department of dell inc. will receive a busy signal.
groupmeanstdevpopulation nmen51411280382women48510392420the cutoff for mathematics scores is 550. how many texas men
A geologist you spoke with is concerned about the rate of land erosion around the base of a dam. Another geologist is studying the magma activity within the earth in an area of New Zealand known for its volcanic activity.
in a gallup poll of 1003 randomly selected subjects 373 said that they have a gun in their home. the accompanying
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