A8

Assignment8.xlsx

Problem 1

1. (5 points) When asked on a recent survey, the general public believes there are on average μ=50 shark attacks in U.S. costal waters each year.
Construct a two-tailed hypothesis test to see whether or not the public perception of the number of shark attacks is skewed.
Year	# Shark Attacks		Type Answers in the Spaces Below
1992	46	Name:
1993	50	H0:
1994	37	H1:
1995	30	N:
1996	45	Mu:
1997	40	Sample Average:
1998	41	Sample Variance:
1999	40	Sample Standard Deviation:
2000	30	Level of Confidence:
2001	36	Alpha Level:
2002	32	t:
2003	27	t-Alpha/2:
2004	48	Reject H0? (Yes or no):
2005	42	Interpretation:
2006	35
			When finished, go on to problem 2 in the sheet tab below that says "Problem 2"

2. (5 points) Suppose that the number of parking tickets given out each week by officers in the city of Hamptonville is μ=21.
Below is the parking ticket data from the overnight shift officers.
Do the overnight shift officers give out significantly fewer tickets than the average officer in Hamptonville?
Officer	Number of tickets		Type Answers in the Spaces Below
Antetokounmpo	37	H0:
Bradley	11	H1:
Cacok	12	N:
Caldwell-Pope	1	Mu:
Caruso	4	Sample Average:
Cook	28	Sample Variance:
Daniels	30	Sample Standard Deviation:
Dudley	10	Level of Confidence:
Green	14	Alpha Level:
Horton-Tucker	5	t:
Howard	39	t-Alpha:
James	23	Reject H0? (Yes or no):
Kuzma	0	Interpretation:
McGee	7
Smith	21		When finished, go on to problem 3 in the sheet tab below that says "Problem 3"
Norvell	21
Rondo	9
Waiters	18

3. (5 points) Suppose that students are preparing to take a standardized test, and in the process of doing so they are allowed to take a practice exam twice.
All of the following students took the practice exam once before taking the test-prep course, and then they took the practice exam after taking the test-prep course.
Did the test-prep course lead students to perform better?
Student	Score before test-prep course	Score after test-prep course	d = x1 - x2		Type Answers in the Spaces Below
Lisa	93	96		H0:
Bart	40	37		H1:
Maggie	70	74		N:
Homer	50	59		Mu of d:
Marge	83	88		Sample Average of d:
Moe	81	88		Sample Variance of d:
Milhouse	67	81		Sample Standard Deviation of d:
Nelson	81	79		Level of Confidence:
Ned	90	94		Alpha Level:
Edna	92	95		t:
				t-Alpha:
				Reject H0? (Yes or no):
				Interpretation:
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