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Guy thinks that NBA players, in general, are taller than high school basketball players. he has measured 5 NBA players, with heights 80, 84,73, 75 and 77 inches. He has measured 5 high school basketball players with heights 72, 74, 78, 73 and 76 inches. he calculates a sample mean of 77.8 for the NBA players and 74.6 for high school players. The NBA sample mean minues the high school sample mean is 3.2. He creates a randomization test to show this theory, uing the test stats described above. what is the p-valuve? round to the nearest percent
10%
11%
12% or
13%
to use a paired t confidence interval to estimate the population mean difference in responses or to perform a paired t
Calculate the correlation coefficient. What is the coefficient of determination from these sample statistics? What does this coefficient indicate?
A 95% confidence interval for the proportion of all adults who bought a lottery ticket in the past year is (assume Gallup used an SRS)
Given a normal distribution of data, we know from the Empirical Rule that in between 2 standard deviations from the mean
Find the least-squares regression line to predict chirps per second based on temperature. increase in temperature. Predict the chirps per second if it is 83.3 degrees.
If 3 different factor levels show a lot of variation between levels this implies:
A particular factory can only inspect 46 mice per hour with a standard deviation of 10. At alpha=0.02 company have reason to believe that these inspectors are slower than average?
We wish to compare the average sales in two shops, to see if the population mean of the first one is higher than the second one. One shop had 100 sales averaging $94, with a standard deviation of $40.
A small pilot study is being conducted to determine the association between maternal age and birth weight. First, from all the single births in 2009 at Hospital X with mothers aged ? 20 years, we randomly selected 15 records.
What is the alternative hypothesis for a null hypothesis stating that the average time a person keeps a cell phone is, at most, three years?
The results of a published research study indicated that babies fed on breast milk gained an average of 11 ounces per week; babies fed a powdered instant baby formula gained an average of 2 ounces per week.
The probability that a student passes a written test for a private pilot's license is 0.75. What is the probability that a student will fail the test on the first attempt and pass it on the second attempt?
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