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The drying time of a certain type of paint under specified test conditions is known to have mean value 75 minutes. Chemists have proposed a new additive designed to decrease average drying time. Because of the expense associated with the additive, evidence should strongly suggest an improvement in average drying time before the additive is adopted-i.e., only if the null hypothesis is rejected will the additive be declared successful and used.
a) Define the parameter of interest and state the relevant hypotheses.
b) For a sample of n = 35 randomly selected observations, x-bar= 72.6 and s = 9. Conduct a hypothesis test for the hypotheses that you stated in part a at (aplha) = 0.05.
c) If x-bar had been 70 minutes instead of 72.6 minutes (assume s = 9 still), would you reach the same conclusion that you did in part b above? Explain. (Support your explanation with statistical evidence.)
A function sometimes associated with a continuous nonnegative random variable is the failure rate (or hazard rate) function which is defined as:
1. the time it takes to train a newly hired telephone sales representative is normally distributed with a mean of 136
based on the number of voids a ferrite slab is classified as either high medium or low. historically 5 of the slabs
The general social survey is an annual survey given to about 1,500 U.S. adults selected at random. Each year, the survey contains several questions meant to probe the respondents' views of employment.
Compute the value of the test statistic (to 2 decimals).
Complete hypothesis test using a 5% level for risk with directional research hypothesis.
The current advertising campaign for a major automobile brand would be changed if fewer than 70 percent of the consumers like it.
suppose 20 of the people in a city prefer pepsi cola as their soft drink of choice. if a random sample of six people
The one-sample t statistic has the value t = -1.68. What do we know about the P -value of this test?
A number of minor automobile accidents occur at various high-risk intersections in Teton County despite traffic lights. The Traffic Department claims that a modification in the type of light will reduce these accidents.
in order to determine the average weight of carry-on luggage by passengers in airplanes a sample of 16 pieces of
use the given information to find the minimum sample size required to estimate an unknown population mean micro.margin
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