D Question 2 2.38 pts Systolic blood pressure in healthy adults has a normal distribution with mean 112 mmHg and standard deviation 10 mmHg. What percentage of adults will have blood pressure above 122 mmHg? O 68 16 O 50 O 0.3The Nielsen company collects a simple random sample of residents in Lexington and has each member take a survey about their local shopping habits (no one refuses to fill out the survey). What is a potential weakness of this sampling strategy? A lot of demographic information must be known about the population prior to sampling O It is probably expensive relative to taking census of the population of Lexington O The sample may not be representative O There are no weaknessesD Question 5 2.38 pts Using the standard normal distribution, what is the probability that z is between 0 and 1.1? O 0.86 O 0.22 O 0.44 0 0.36Question 6 2.38 pts Historical trends show that the average renter in Fayette county pays rent 1.5 days early. An economist collects a sample of 250 renters in Fayette in order to test whether this number was lower than 1.5 for the month of July 2020. The sample mean is 0.3, and the population standard deviation is assumed to be 2.9. What is the test statistic (z score)? O 5.08 O -6.54 0 3.98 O -4.67D Question 8 2.38 pts At the end of the semester, the median grade in a statistics class is equal to 81, yet no student in the class had a final grade of 81. Which of the following must be true? There is an even number of students in the class O The data contain outliers O The grades have a high variance O There are multiple modes * Previous NextD Question 12 2.38 pts A standardized test has scores that are normally distributed with a mean of 120 and a standard deviation of 20. Anastasia scores a 110. What is the z-score corresponding to her test score? O 2 O 0.5 O -2 0 -0.5 Previous NextD Question 15 2.38 pts Which of the following variables is discrete? O Head circumference of infants O Finishing times for a 100 meter race O Volume of soda cans Number of televisions in a household 1 Previous Ndyt .2.38 pts X is a random variable that is normally distributed with a mean of O and standard deviation of 10. If X = 20, what is the corresponding z-score? O 3.88 02 O 3.39 O 1.96 * PreviousQuestion 21 2.38 pts Which of the following is not a property of the normal distribution? The area underneath the curve and to the right of the mean is 1 O It has a bell shape O The mean, median, and mode are all equal O The tails asymptotically approach the horizontal axis . Previous Next2.38 pts A researcher surveys a group of respondents to determine the average amount of time spent in a car per day. She tests the hypothesis that this amount of time is larger than 30 minutes and rejects the null hypothesis at the 1% level. Which of the following is true? O She can possibly reject the null hypothesis at the 5% level, but possibly cannot O She can certainly not reject the null hypothesis at the 10% level She can certainly not reject the null hypothesis at the 5% level O She can certainly reject the null hypothesis at the 5% level . Previous next