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The Smoky Bear Trucking Company claims the average weight of a fully loaded moving van is 12,000 lb. The highway patrol decides to check this claim. A random sample of 30 Smoky Bear moving vans shows that the average weight is 12,100 lbs, with a standard deviation of 800 lbs. Construct a hypothesis test to determine whether the average weight of a Smoky Bear moving van is more that 12,000 lb. Us a 5% level of significance.
a. State the null and alternate hypothesis.b. Identify the sampling distribution to be used (Normal, Student t, or binomial)c. What is the critical value?d. Decide whether to reject or not reject the null hypothesis at the given significance level.e. Explain your conclusion is simple non-technical terms.
Subscribe to Cool Teen and 35% subscribe to neither magazine, what is the probability that a randomly selected teenager subscribes to both magazines?
Of the 600 employees, 400 had college degrees, 100 were single, and 60 were single college graduates. The probability that an employee of the hospital is single or has a college degree is?
The quality-control manager at a light bulb factory needs to determine whether the mean life of a large shipment of light bulbs is equal to 375 hours. The population standard deviation is 100 hours.
The Investment Research Institute reported in its Mutual Fund Fact Book that the number of mutual funds increased from 5725 in 1999 to 7977 in 2009. What is the geometric mean annual percent increase in the number of funds?
The main goal of correlation research is ______________
A survey was conducted to measure height off men. In survey, respondents were grouped by age. In the 20-29 age group, the heights were normally distributed, with a mean of 69.2 inches and a standard deviation of 2.0 inches.
15 watch between 10 and 15 hrs per week and 10 watch less than 10 hrs per week. Determine whether there is a relationship between education levels and hours spent watching TV.
A machine produces 5-inch nails. A sample of 12 nails was selected and their lengths determined. The results are as follows: State the null and alternate hypotheses. Calculate the mean and standard deviation.
x and s are equal to 3.7 and 0.5, respectively, find a 99% confidence interval for the mean pH in rainfall and interpret the interval.
Compute the proper measure of association of smoking and lung cancer.
If the process mean remains at 12.05 oz, what must the standard deviation be so that 99% of the cans will contain 12 oz or more?
Would it be unlikely for them to find fewer than 65 children with the gene? Calculate the z-score and base your response upon the z-score.
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