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Many, many snails have a one-mile race, and the time it takes for them to finish is approximately normally distributed with mean 50 hours and standard deviation 6 hours.
For the following questions, use the normal chart and the method in class. The correct procedure results in precisely the required accuracy.
The percentage of snails that take more than 60 hours to finish is %.
The relative frequency of snails that take less than 60 hours to finish is
The proportion of snails that take between 60 and 67 hours to finish is
The probability that a randomly-chosen snail will take more than 76 hours to finish (to four decimal places) is
To be among the 10% fastest snails, a snail must finish in at most hours.
The most typical 80% of snails take between and hours to finish.
Suppose a sample of 35 surveys shows a sample mean of 17 minutes. Use = 4 minutes. Is the premium rate justified? Formulate the null and alternative hypotheses for this application.
If random sample of size n = 16 are selected, can we say anything about the xbar distribution of sample means?
An election poll reported that a candidate had an approval rating of 48% with a margin of error E of 3%. Construct a confidence interval for the proportion of adults who approve of the candidate.
Why do so many of life's events share the same characteristics with Central Limit Theorem? Why are estimations and confidence intervals important?
Why is the F distribution important? How do you determine if a significant difference exists among the groups in ANOVA? How do you determine differences between the groups in ANOVA?
Find the expected value if the cost of entering this sweepstakes is the cost of a postage stamp. Is it worth entering the contest?
Assume that a random sample is used to est. a population proportion p. find margin of error E that corresponds to the given statistics and confidence level. 98% confidence sample size 1166 of whic are 35% successes. What is margin of error?
we break a stick at a uniformly chosen random location. find the probability that the shorter piece is less than 15th
keyless entry clickers are used to open doors in a variety of products. suppose you are a quality control statistician
given a standardized normal distribution with a mean of 0 and a standard devication of 1 determine the following
A sample of 16 consumers is taken. The average age in the sample was 22.5 years with a standard deviation of 5 years. Construct a 95% confidence level.
On a graph, the vertical difference between the observed and predicted values of the response variable for an individual is called the
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