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In a random sample of 28 families, the average weekly food expense was $95.60 with a standard deviation of $22.50. Determine whether a normal distribution or a t-distribution should be used or whether neither of these can be used to construct a confidence interval. Assume the distribution of weekly food expenses is normally shaped.
Translate the following arguments into symbolic notation.- If sea levels rise twenty feet worldwide, then coastal cities from New York to Sydney will be inundated.
the turkeys found in a county in southern ohio have an average weight of 15.6 pounds with a standard deviation of 4.0
Develop percent frequency distribution and construct bar chart and pie chart.
the labor bureau wants to estimate at a 98 confidence level the proportion of all households that receive welfare. the
What is the probability that at most 20 people liked the movie?-What is the probability that at least 25 people liked the movie?
A political pollster randomly selects a sample of 100 voters each day for 8 successive days and asks how many will vote for the incumbent. The pollster wishes to construct a p chart to see if the percentage favoring the incumbent candidate is too err..
Develop a scatter diagram with price as the independent variable and what does the scatter diagram developed in part (a) indicate about the relationship between the two variables?
Let X1, X2,... denote an iid sequence of random variables, each with expected value 75 and standard deviation 15. (a) How many samples n do we need to guarantee that the sample mean Mn(X) is between 74 and 76 with probability 0.99?
In 2001, an estimated 78% of executives believed that age bias was a serious problem. In a 2004, 82% of the executives surveyed considered age bias a serious problem.
Use the method of least squares to fit the model to the data if y is the possible number of unrooted walks.- Interpret β^0 and β^1 in the estimated model, part a.
What is the p-value of a chi-square test of statistical significance for the relationship between Sex and Use Cell? Is the observed relationship statistically significant?
What is your null hypothesis? What is your alternative hypothesis? What your decision about the null hypothesis?
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