Blog

A large intro class did a bead box activity to estimate the proportion of blue beads in a very large box of beads.  2000 students took random samples of size 100 and recorded their sample proportions.   A dotplot of these 2000 proportions is found below.  Your sample proportion was 0.50. Based on the sampling distribution found above, which of the below options is closest to the true population proportion of blue beads in the box?

A  study considered the following two variables: 1. How many times went to the dentist in past year : never or once 2. Have a cavity:  no    yes     no yes total never 44  3  47 once 49  4  53 total 93  7  100 Match the statistic to its corresponding calculation

Two researchers completed the same study when considering the same hypothesis test. Researcher A obtained a p-value of 0.10. Researcher B obtained a p-value of 0.13. Based on this information, the p-value from researcher [answer1] provides stronger evidence against the null and in favor of the alternative.  Using a significance level of 0.05, researcher A should [answer2] the null and researcher B should [answer3] the null.

Consider the average price of doughnuts from 200 bakeries in the United States. For the population of interest, a 95% confidence interval for the average price per doughnut is $1.70 plus or minus 0.45 cents.  For this example, match the numbers below to the correct statistical terms:

Note: If you have trouble seeing the images, use Ctrl 

Solve the equation.logz(8) =

Solve the equation. If necessary, round to thousandths.eln(x) = 8

Evaluate the exponential expression.272/3

Solve the equation.3(9 – 3x) = 27

Find the inverse of the function.f(x) = log8(x)