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A firm wanted to see if there was a significant difference between two neighboring communities in terms of the mean number of members per household. A random survey of 100 households in the first community showed the mean household size was 3 with a standard deviation of 5. In the second community, a random survey of 90 households showed the mean household size was 4 with a standard deviation of 6. Assuming a significance level of .01, test the hypothesis that the two communities are statistically equivalent with respect to household size.
At a 5% level of significance, is there sufficient evidence that the population mean waiting time is now less than 3.7 minutes?
a large tank of fish from a hatchery is being delivered to a lake. the hatchery claims that the mean length of fish in
Explain the ANOVA output table values:
Calculate sample proportion and then also calculate a 99% confidence interval for true population proportion, p.
What is the probability that the sample proportion,p^ , will be within ± 3 percentage points of the true p, i.e., Pr{0.42 ≤p^ ≤ 0.48}?
The life expectancy of computer terminals is normally distributed with a mean of 4 years and a standard deviation of 10 months. What is the probability that a randomly selected terminal will last more than 5 years?
Complete the exercise to determine if one store is better than the other in terms of mean family grocery price using a = .05. Clearly tell which is better if you decide this is appropriate.
A standard deviation of 12. If the data for both tests are normally distributed, on which test did the student score better relative to the other students in each class?
A report on the U.S. economy indicates that 28% of Americans have experienced difficulty in making mortgage payments. A news organization randomly sampled 400 Americans from 10 cities named the "fastest dying cities in the U.S."
What would be a good example of a null and alternative hypotheses for a decision relevant in life? What Type I and Type II errors could occur with your decision-making process?
According to a well-known newspaper journal, 58.3% of the 222,900 households in particular county get the Sunday edition of local newspaper. Assume that random samples of 200 households are selected.
part-11. mutually exclusive events are also independent. false2. if events a and b are independent then the probability
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