A student researcher compares the ages of cars owned by students and cars owned by faculty at a local state college. A sample of 228 cars owned by students had an average age of 8.2 years. A sample of 222 cars owned by faculty had an average age of 5.83 years. Assume that the population standard deviation for cars owned by students is 3.36 years, while the population standard deviation for cars owned by faculty is 3.27 years. Determine the 90% confidence interval for the difference between the true mean ages for cars owned by students and faculty. Step 1 of 3 : Find the point estimate for the true difference between the population means.

4a. is 3 miles every hour

4b. is 1/3 of an hour per mile

step-by-step explanation:

c.   x=2.4cm

step-by-step explanation:

similar triangles are triangles which have the same shape but not the same size. this means their angle measures are equal but their side lengths are not instead they are proportional. to solve, we will set up a proportion and solve.

a proportion is two equal ratios set equal to each other. we form the ratios by finding corresponding sides (sides which match to each other on both triangles by their position). out ratios will be one side of the small triangle over the corresponding side on the big triangle as shown below:

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to solve the proportion, we'll cross multiply by multiplying numerator with denominator across the equal sign.

3 is greater then both of those numbers