A farmer was interested in determining how many grasshoppers were in his field. He knows that the distribution of grasshoppers may not be normally distributed in his field due to growing conditions.
As he drives his tractor down each row he counts how many grasshoppers he sees flying away. After several rows he figures the mean number of flights to be 57 with a standard deviation of 12. What is the probability of the farmer will count 60 or more flights on average in the next 40 rows down which he drives his tractor? A) 0.0571 B) 0.4429 C) 0.9429 D) 0.5710
Q. 2The mean age of professors at a university is 57.9 years. If a hypothesis test is performed, how should you interpret a decision that fails to reject the null hypothesis?
A) There is not sufficient evidence to reject the claim = 57.9.
B) There is sufficient evidence to reject the claim = 57.9.
C) There is sufficient evidence to support the claim = 57.9.
D) There is not sufficient evidence to support the claim = 57.9.
Q. 3The mean age of principals in a local school district is 50.2 years. If a hypothesis test is performed, how should you interpret a decision that rejects the null hypothesis?
A) There is sufficient evidence to reject the claim = 50.2.
B) There is not sufficient evidence to reject the claim = 50.2.
C) There is sufficient evidence to support the claim = 50.2.
D) There is not sufficient evidence to support the claim = 50.2.
Q. 4A medical salesperson is to visit the various members of the staff at a clinic. He must see 8 doctors, 6 physicians assistants, 12 nurses, 3 medical technologists, and 3 receptionists.
How many different ways can these people be visited by the salesperson if the order is not important? A) 5184 B) 32 C) 25,920 D) 6,220,800
Q. 5A college dean believes that the median hours spent studying by full time students is at least 13 hours per week.
In a random sample of 100 students, 64 studied more than 13 hours, 10 studied exactly 13 hours and the rest studied less than 13 hours. Find the critical value to test the deans hypothesis. Use = 0.05. A) -1.645 B) -1.96 C) -2.33 D) -2.575
Q. 6The amount of money collected by a snack bar at a large university has been recorded daily for the past five years. Records indicate that the mean daily amount collected is 4000 and the standard deviation is 450.
The distribution is skewed to the right due to several high volume days (including football game days). Suppose that 100 days were randomly selected from the five years and the average amount collected from those days was recorded. Which of the following describes the sampling distribution of the sample mean? A) normally distributed with a mean of 4000 and a standard deviation of 45
B) normally distributed with a mean of 4000 and a standard deviation of 450
C) normally distributed with a mean of 400 and a standard deviation of 45
D) skewed to the right with a mean of 4000 and a standard deviation of 450
Q. 7The ______________ hypothesis contains the = sign.
A) null B) alternative C) explanatory D) conditional
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