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An election poll reported that a candidate had an approval rating of 34% with a margin of error E of 2%. Construct a confidence interval for the proportion of adults who approve of the candidate.
For each problem, compute a Welch F-statistic and determine whether or not significant differences exist among the treatment conditions.
A skeptical paranormal researcher claims that the proportion of Americans that have seen a UFO is less than 1 in every one thousand. State the null hypothesis and the alternative hypothesis for a test of significance.
At the .05 level, you are testing whether there is a significant difference in the proportions of college students and similar aged non college students having accidents during the two year period. What is the value of your test statistic.
When water taxi sank in the Baltimore Inner Harbor, an investigation revealed that the safe passenger load for water taxi was 3500 lbs. It was also noted that the mean weight of passenger was assumed to be 140 lbs.
A random sample of gasoline taxes (in cents) is shown here for 12 states. Use the data to estimate the true population mean gasoline tax with 90% confidence. Does your interval contain the national average of 44.7 cents?
He completed 1st seven times, 2nd three times, and one time each in 6th, 9th,12th, 15th, 22nd and 37t. Determine his median finishing position for the year.
A survey found that women's heights are normally distributed with mean 63.6 in and standard devistion 2.5 in. a branch of the military requires women's heights to be between 58 in and 80 in. What is the percentage of women who meet the height requ..
For following set of scores, prepare a frequency distribution, a histogram, and a stem-and-leaf display for each variable. Also calculate the mean, the median and the standard deviation of each score.
Assume that the smiling time of eight-week old babies, in seconds, follows a uniform distribution between 0 and 23 seconds, inclusive. This means that any smiling time from 0 to and including 23 seconds is equally likely.
If the number of heads turns out to equal one of your 11 numbers, you win a dollar. which 11 numbers should you pick, and what is your chance of winning? explain.
Sampling variability refers to the idea that different samples will include different individuals
At the .01 significance level, can the manufacturer conclude that the price reduction resulted in an increase in sales?
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