stats

the average yearly snowfall in chillyville is approximately normally distributed with a mean of 55 inches. if the snowfall in chillyville exceeds 60 inches in 15% of the years, what is the standard deviation

4.83

the figure shows a cumulative relative frequency graph of the number of ounces of alcohol consumed per week in a sample of 150 adults who report drinking alcohol occasionally. about what percent of these adults consume between 4 and 8 ounces per week

40%

forty students took a statistics test worth 50 points. the dor plot displays the data. the third quartile is

44

which of the following is most likely true

mean > median, range > IQR

an experiment was conducted to investigate the effect of a new weed killer to prevent weed growth in onion crop. two chemicals were used: the standard weed killer (S) and the new chemical (N). both chemicals were tested at high and low concentrations on 50 test plots. the percent of weeds that get in each plot was recorded. here are some bloxplots of the results. which of the following is not a correct statement about the results of this experiment

high and low concentrations of either chemical have approximately the same effects on weed growth

the mean salary of all female worker at a company is $35,000. the mean salary of all male workers at the company is $41,000. what must be true about the mean salary of all workers at the company

it could be any number between $35,000 and $41,000

many profession schools require applicants to take a standardized test. supposed that 1000 students take such a test. several weeks after the test, pete receives his score report: he got a 63, which placed him at the 73rd percentile. this means tht

pete is the same as it better than about 73% of test takers

the standard deviation of the distribution of house age is about 16 years. interpret this valye

the age of the houses in the sample typically varies about 16 years from the mean age

the figure shown is the density curve of a distribution. seven values are marked on the density curve. which of the following statements is true

the area under the curve between A and G is 1

the students in mr. tyson's high school statistics class were recently asked if they would prefer a pasta party, a pizza party, or a donut party. the following bat graph displays the data. this graph is misleading because

the vertical axis scale should start at 0

an airline records data on several variables for each of its flights: model of plane, amount of fuel used, time in flight, number of passengers, and whether the flight arrived on time. the number and type of variables recorded are

2 categorical, 3 quantitative (1 discrete, 2 continuous)

which of the following could be the median age

24 years

for the the normal distribution shown, the standard deviation is closest to

3.

if the heights of a population of men are approximately normally distributed, and the middle 99.7% have heights between 5'0" and 7'0", what is the standard deviation of the heights in this pooukation

4"

what percent of all small companies receiving questionnaires responded

62.5%

which of following conclusions seems to be supported by the data

small companies appear to have a higher response rate than medium or big companies

Rainwater was collected in water collectors at 30 different sites near an industrials complex, and the amount of acidity (pH level) was measured. The the mean and standard deviation of the values are 4.60 and 1.10, respectively. when the pH meter was recalibrated back at the laboratory, it was found to be in error. the error can be corrected by adding 0.1 pH unit to all of the values and then multiplying the result by 1.2. what are the mean and standard deviation of the corrected pH measurements

5.64, 1.32