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In a study on caffeine and stress, college students indicated how many cups of coffee they drink per day and their stress level on a scale of 1 to 103. The data are provided in the following table.
Calculate a Pearson's r to determine the type and strength of the relationship between caffeine and stress level.
How much of the variability in stress score is accounted for by the number of cups of coffee consumed per day?
Number of Cups
Stress Level
3
5
2
4
6
9
1
7
10
8
Milk cartons are advertised to contain one litre of milk. From a random sample of 18 one-litre cartons whose contents were accurately measured by the South African Bureau of Standards (SABS), it was found that the average fill was 0.981 l with a s..
If X = 75, S = 24, and n = 36, and assuming that the population is normally distributed, construct a 95% confidence interval estimate for the population mean, µ.
Industrial wastes and sewage dumped into our rivers and streams absorb oxygen and thereby reduce the amount of dissolved oxygen available for fish and other forms of aquatic life.
Refer to Questionnaire color Problem 16.8. It has been suggested to the investigator that size of parking lot might be a useful concomitant variable. The number of spaces (Xij ) in each parking lot utilized in the study follow.
What is the approximate probability that the average weekly postage expense for the past 52 weeks will exceed the budgeted amount of $ 400?
Develop a 95% confidence interval for the proportion of the population of adults who feel customer service is better today than it was 2 years ago.
The quality of the orange juice produced by a manufacturer (e.g., Minute Maid,Tropicana) is constantly monitored. There are numerous sensory and chemical components that combine to make the best tasting orange juice.
what do you conclude about the claim below? do not use formal procedures or exact calculations. use only the rare event
Explain clearly what is meant by a false negative rate of 5% and a false positive rate of 15%. If the population were screened, what proportion would be expected to test negative for metropathy?
you are visiting las vegas and would like to come home with more money than you arrived with. use your knowledge of
Verify that middle class families allocate a statistically larger average amount on food than poor families using the firm's data. Use a 5% significance level in your verification.
The weights (in pounds) of a sample of five boxes being sent by UPS are: 12, 6, 7, 3, and 10.
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