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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?
The claim is that the proportion of adults who smoked a cigarette in the past week is less than 0.35, and the sample statistics includen=1028 subjects with 350 saying that they smoked a cigarette in the past week. Find the value of the test statis..
Give three logically possible directions of casualty, indicating for each direction whether it is a reasonable explanation for the correlation in light of the variables involved (and why).
compute the mean and variance of the following weights for the population of ferrets on the high plains of
a) How would the confidence interval change if the sample size had been 800 instead of 200? b) How would the confidence interval change if the confidence level had been 90% instead of 95%?
How many independent network servers would be needed if each has 99 percent reliability? (b) If each has 90 percent reliability?
a sample of 77 individuals working at a particular construction site office was selected at random. the noise level dba
A 400-V DC shunt motor has ?eld and armature resistances of respectively 100 and 0.1 Ω. If the motor absorbs 40 kW from the electric grid, calculate the line, armature, and ?eld current.
What would be the estimated total enrollment for an HMO firm that administered 20 plans? Source: The Wall Street Journal Almanac 1999, p. 565.
A regression analysis was performed to assess the impact of the perception of risk on the frequency of online shopping.- Is there statistical evidence of a linear relationship between frequency of online shopping and the level of perceived risk?
Use a t-test to test the claim about the population mean mu at the given level of significance alpha using the given sample statistics. Assume the population is normally distributed.
Design an op-amp circuit to provide an output vO = -[2v1 + (v2/2)]. Choose relatively low values of resistors but ones for which the input current (from each input signal source) does not exceed 50 μA for 1-V input signals.
the claim is that the proportion of adults who smoked a cigarette in the past week is less than 0.35 and the sample
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