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According to Money, a water ?lter (which costs about $26) will save a consumer more than $1 per gallon of water over one year compared with buying bottled water.9 Suppose that a random sample of 15 consumers agrees to participate in a study aimed at proving this claim, and that their results, extrapolated to savings per gallon per year are ($): 0.95, 1.07, 1.09, 1.12, 0.85, 1.17, 1.25, 0.82, 0.99, 1.02, 1.15, 0.90, 1.32, 1.01, 0.88. Conduct the test and state your conclusion.
Test the null hypothesis that no difference exists between the proportions in population 1 and 2 needing major repairs against the alternative that a difference does exist. Use α = 0.10
An epidemiologic investigation was conducted at the high school. Table E4.6 gives the rates of positive tuberculin reaction, determined for various groups of students according to degree of expo-sure to the index case. Calculate the 95% con?dence ..
Calculation of Mode Variance and Standard Deviation for Alcohol-related Accidents by Youngsters
the employees of cartwright manufacturing are awarded efficiency ratings. the distribution of the ratings approximates
Suppose you are given the average pay of all working people in each of the 50 states of the United States. Do you think that the sample mean of the averages for the 50 states will equal the value given for the entire United States?
If university officials say that at least 70% of the voting student population supporting the fee increase, what conclusion can be drawn based on a 95% level of confidence?
In our discussions of basic probability theory the concepts of mutually exclusive events and independent events share prominent roles.
hannah selected a simple random sample of all adults in her town and based on this sample constructed a confidence
A company that produces an expensive stereo component is considering offering a warranty on the component. Suppose the population of lifetimes of the components is a normal distribution with mean of 84 months and standard deviation of 10 months.
you are estimating the cost k of optical sensors based on the power output of the sensor. using the preliminary
The ages (in days) at time of death for samples of 11 girls and 16 boys who died of sudden infant death syndrome are shown in Table E4.22. Calculate separately for boys and girls the 95% confidence interval for the (population) mean of age (in day..
The IQs of 17 students from one area of a city showed a mean of 106 with a standard deviation of 10, whereas the IQs of 14 students from another area showed a mean of 109 with a standard deviation of 7. Test for equality of variances between the I..
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