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Question: Odometers measure automobile mileage. How close to the truth is the number that is registered? Suppose 12 cars traveled exactly 10 miles (measured by surveying) and the following mileage figures were recorded by the odometers. State the null hypothesis, choose an alternative hypothesis, perform a t test, and write a conclusion.
9.8 10.1 10.3 10.2 9.9 10.4 9.9 10.3 10.0 10.1 10.2
For a single-factor study with, r = 2 treatments and sample sizes ni = 10,find the T, S and B multiples for g = 1 pairwise comparison with a 99 percent confidence coefficients. What generalization is suggested by your results?
Find the t value for 5, 2.5, and 0.5% of the area within each tail for a sample size, n, that is very large or infinite. How do these t values compare with corresponding z values?
On the basis of previous knowledge with this type of lightbulb, the firm knows a = 30 h. How large a sample would the firm take
Test for normality of the variables Temperature, Relative humidity and Wind separately using normal probability plot - Construct a 95% confidence interval for each of the variables in part (a).
Preemies. Do the effects of being born prematurely linger into adulthood? Researchers examined 242 Cleveland-area children born prematurely between 1977.
High School GPA is normally distributed with a mean of 3.06 and a standard deviation of 0.40. The probability of a randomly chosen student having a HS GPA between 3.54 and 3.80 is
Either summarize your design or give an appropriate layout with table.
Suppose we generate a random variable X in the following way. First we ?ip a fair coin. If the coin is heads, take X to have a Unif(0,1) distribution. If the coin is tails, take X to have a Unif(3,4) distribution.
Compare and contrast a Difference of Means test with a Paired Difference test. What, fundamentally, are we testing for in each? When do you use the difference of means?
Create a dummy variable based on the variable gender. The dummy should equal 1 for male children and 0 otherwise. Name this variable gender dum.
Write the stems again, and rearrange the leaves in increasing order out from each stem. We are interested in the distribution of the data? What would be appropriate to display this?
A scatterplot showed a linear relationship with a correlation between age and body temperature of -0.313. Using this value, characterize the relationship between age and body temperature.
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