Lake Superior has ice for a long period each winter.   Below is some data and a scatterplot of the number of days ice was present at one of the stations on Lake Superior versus the mean temperature for the months of December through April, for nine seasons (1966-67 through 1974-75).                         The least squares regression line fit to this data is Days of Ice = 253.0 – 6.254 x Mean Temperature with r-squared = 57.1%.  Type a complete interpretation of the slope of the regression equation in the context of this scenario.

Researchers are exploring whether blood type is associated with heart disease risk. A sample of adults is selected. Each person’s blood type is recorded as A, B, AB or O and their heart disease risk is classified as low, medium, or high. The results are shown in the table below. Heart Disease Risk Blood Type Low Medium High Total A 92 26 14 132 B 23 11 4 38 AB 10 7 2 19 O 132 21 8 161 Total 257 65 28 350 Use the table below to answer the questions below. Enter your answers as fractions that are not simplified. What is the probability an individual selected from the table has an A blood type? [an]/[ad] What is the probability an individual selected from the table has a B blood type and medium heart disease risk? [bn]/[bd] What is the probability an individual selected from the table has an AB blood type or low heart disease risk? [cn]/[cd] What is the probability an individual with an O blood type has high heart disease risk? [dn]/[dd]

When a nonprofit entity’s net assets are presented as net assets with donor restrictions, who has imposed the restrictions?

The Turtle Island Singers receive three gifts during the current year: (a) $3,000, which may be used for any purpose at any time; (b) $5,000, which must be used for a special concert given in a nursing home; and (c) $1,000, which may be used for any purpose, but only in the next fiscal year. When it receives the gifts, how should the entity classify them:

School health officials wanted to investigate if there is a relationship between Streptococcus pyogenes carrier status and tonsil size. A sample of 1,500 of schoolchildren were selected at random and each child’s carrier status (carrier or not) and tonsil size (normal, large, very large) were recorded. Which of the following tests should be used? 

Aerobic respiration results in products that must be detoxified to keep our cells healthy. Match the correct enzyme with it’s substrate.

Two statistics students decide to find out if name-brand trash bags hold more weight than store-brand trash bags.  They randomly select 15 trash bags of each type: Brand A, Brand B, and Store Brand and filled them with oranges until they broke. The number of oranges in the bag when the the bags broke was recorded for each bag.    The appropriate hypothesis test was performed on the data and resulted in a p-value < 0.0001.  Using the 0.01 level of significance, select the correct conclusion.  

You test a blood pressure app against a traditional blood pressure cuff by taking your blood pressure twice (randomizing the order of app and cuff) over a period of 30 days. A 95% confidence interval for the difference in mean systolic blood pressure (traditional – app), measured in mmHg, is (5.5, 10.2).  Which of the following statements is correct?

Funerary kraters were used as wine vessels in ancient Greece.

How many vaccines do older adults get per year? To estimate this quantity, a sample of adults aged 65 and over is selected. Each adult reports how many vaccines they received in the previous year. Which of the following inference procedures should be used?