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The average hourly wage of workers at a car wash is $6.50/hr. Assume the wages are normally distributed with a standard deviation of $0.45. If a worker at this car wash is selected at random, what is the probability that the worker earns more than $6.75?
Test hypothesis that intake of linoleic acid in this group is lower than that of general population. Also, calculate p-value for hypothesis test.
Many vehicles used in space travel are constructed with redundant systems to protect the flight crew and their equipment. Find the probability that this shuttle component functions successfully if n = 2.
Construct three scatter plots for: (1) percentage alcohol versus calories, (2) percentage alcohol verses carbobydrates, and (3) calories versus carbohydrates
Of the 1,4000 homemakers sampled, 420 were able to identify the brand by name. Compute the standard error of the proportion.
Determine x-bar and s for this data set. You may suppose the values for bulb life are normally distributed. Use traditional method to make your decision.
Describe the error in the conclusion. Given: There is a linear correlation between the number of cigarettes smoked and the pulse rate. As the number of cigarettes increases the pulse rate increases. Conclusion: Cigarettes cause the pulse rate to i..
Can the formal hypothesis testing approach be used for nonparametric tests? How are parametric and nonparametric statistics different?
An automobile manufacturer advertises that the mean petrol consumption of its new hybrid car does not exceed 4.6 litres per 100 km. An independent company decides to test the manufacturer's claim by selecting a random sample of 16 vehicles and mea..
Perform a contingency analysis on the data to determine if there is any dependency between the number of level of education attained by the father and the size of his family.
For the following situation, assume the random variable is normally distributed and use a normal distribution or a t-distribution to construct a 90% confidence interval for the population mean. If convenient, use technology to construct the confid..
Additionally, method of delivery of drug (patch,pill, or nasal mist) was considered. In experiment, there were how many treatments?
A sample of 64 statistics students at a small college had a mean mathematics ACT score of 28 with a standard deviation of 4. Estimate the mean mathematics ACT score for all statistics students at this college. Give the 95% confidence interval.
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