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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.
A person runs one mile to his house as fast as he can. It is equally likely that he will run at an average speed of 3 miles per hour, 6 miles per hour, and 9 miles per hour.
Explain the difference between independent samples and dependent samples. Classify the following as independent or dependent samples:
Describe the difference in the determination of a confidence interval of a normal distribution if the variance is known or unknown.
The probability is 1 in 4,000,000 that a single auto trip in the United States will result in a fatality. Over a lifetime, an average U.S. driver takes 50,000 trips. (a) What is the probability of a fatal accident over a lifetime? Explain your rea..
Use the study to estimate the risk of an air bag fatality on a child seated on the front passenger seat.
At 0.05 level of significance, is there evidence of noteworthy difference in variation in sales among different aisle locations?
The researcher found that Lincoln's educational score did not correlate with the expected variables.
Let z represent the standard normal variable and suppose a value is randomly selected. Find each of the following probabilities by:
A new cell phone battery is being considered as a replacement for the current one. Ten college student cell phone users are selected to try each battery in their usual mix of "talk" and "standby" and to record the number of hours until recharge wa..
Find the percent of a standard Normal model found in the given region. Round to the nearest hundredth of a percent.
Construct a 90% confidence interval on the difference in fraction nonconforming between the two processes."
Bivariate data for the quantitative variables x and y are given in the attached. These data are plotted in a scatter plot. Sketch an approximation of at the least-squares regression line for the data.
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