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Hypothesis testing and confidence interval for two proportions:
In a study to estimate the proportion of housewives who own IPods, it is found that 120 out of 200 suburban residents and 240 out of 500 urban residents own IPods.
a) Is there a significant difference between the proportion of suburban and urban housewives who own IPods? Use α = 0.04.
b) Establish a 99% confidence interval for the difference in the proportion of suburban and urban housewives who own IPod.
c) Estimate the type II (β) if the alternative hypothesis is:
i)two-sided, i.e.: p1 ¹ p2, with α = 0.01 ii)one-sided, i.e.: p1 > p2, with α = 0.05 iii)one-sided, i.e.: p1 < p2, with α = 0.025
d) Compute the common sample size for the two sided alternative hypotheses in part (c)
Evaluate true mean delivery time to within 5 minutes at 90% reliability level? Suppose that standard deviation for delivery times is 18.2 minutes.
What percent of the Fords traveled 62.000 miles or less during the year?
At 0.01 level of significance, is there evidence that mean price is higher at Whole Foods Market than at Fairyway supermarket? Interpret the meaning of p-value in (i).
When combining probabilities, to find the probability of one event AND another event, the separate probabilities should be
Select the variable team salary and find the mean, median, and the standard deviation
In a regression model involving 30 observations, the following estimated regression equation was obtained:
At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
Which of the following statements is consistent with the scatterplot
Plan the scatter diagram
Categorize the events as dependent or independent. Events A and B where P (A) = 0.7, P (B) = 0.8, and P (A and B) = 0.56.
Regression equation to predict the dependent variable using multiple regression analysis:
If the mean times for both George and Julia are actually the same, what is the probability that George will be let go?
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