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Confidence interval for population mean.
A survey conducted by the American Automobile Association showed that the family of four spends an average of $215.60 per day while on vacation. Suppose a sample of 64 families of four vacationing at Niagara Falls results in a sample mean of $252.45 per day and a sample standard deviation of $75.500.
a) Develop a 95% confidence interval estimated of the mean amount spent per day by a family of four visiting Niagara Fall.
b) Based on the confidence interval from part (a), does it appears that the population mean amount spend per day by families visiting Niagara Falls differs from the mean reported by the American Association? Explain.
The level of significance indicates the probability of rejecting a false null hypothesis.
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What is the probability that the mean completion time is between 1 and 2 hours, i.e.., 60 and 120 minutes?
At the .01 significance level, is there a difference in the mean number of times men and Women order take-out dinners in a month? What is the p -value?
Would the null hypothesis be accepted or rejected in this case?
The mean number of passengers per flight is 160 with a standard deviation of 20. The aircraft used for the route has 200 seats.
Construct a 90 percent confidence interval for the true mean weight. Describe factors which might cause variation in the weight of Tootsie Rolls during manufacture.
Use the t test to determine whether the slope of the regression model is significant at α = 0.05.
Test whether the music reduces studying capacity at a .05 level of significance.
Determine the probability the transmission will break down between 100,000 and 200,000 miles?
Sampling variability refers to the idea that different samples will include different individuals
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