Question

1. An energy official claims that the mean oil output per well in the US is less than the 1998 level of 11.1 barrels per day. He randomly samples 50 wells throughout the US and determines the mean output to be 10.7 barrels per day. Assume the population standard deviation is 1.3 barrels. Test the researcher's claim at a 0.05 significance level.

   Identify the null and alternative hypotheses.

   		H1: μ < 11.1 H0: μ > 11.1
   		H1: μ > 11.1 H0: μ = 11.1
   		H1: μ < 11.1 H0: μ = 11.1
   		H1: μ = 11.1 H0: μ > 11.1

  

QUESTION 2

1. Oil: What type test will be used?

   		left-tailed test
   		right-tailed test
   		two-tailed test
   		no-tailed test

QUESTION 3

1. Oil: Compute the test statistic. (Round your answer to 2 decimal places.)

QUESTION 4

1. Oil: What is the P-value? (Answer to 4 decimal places.)

QUESTION 5

1. Oil: What do you decide?

   		P > α so fail to reject H0
   		P < α so reject H0
   		P < α so fail to reject H0
   		P > α so reject H0

QUESTION 6

1. Oil: Which is the correct conclusion for the test?

   		There is enough evidence to reject the claim that the oil output is less than the 1998 level.
   		There is not enough evidence to reject the claim that the oil output is less than the 1998 level.
   		There is enough evidence to support the claim that the oil output is less than the 1998 level.
   		There is not enough evidence to support the claim that the oil output is less than the 1998 level.

QUESTION 7

1. The business college computing center wants to determine the proportion of business students who have personal computers (PC's) at home. If the proportion is less than 30%, then the lab will scale back a proposed enlargement of its facilities. Suppose 200 business students were randomly sampled and 56 have PC's at home. Test the claim that fewer than 30% have a PC at home. Use a 0.01 level of significance.

   Identify the null and alternative hypotheses.

   		H1: p < .30 H0: p > .30
   		H1: p > .30 H0: p = .30
   		H1: p = .30 H0: p > .30
   		H1: p < .30 H0: p = .30

QUESTION 8

1. PC: What type test will be used?

   		left-tailed test
   		right-tailed test
   		two-tailed test
   		no-tailed test

  

QUESTION 9

1. PC: Compute the test statistic. (Round your answer to 2 decimal places.)

QUESTION 10

1. PC: What is the P-value? (Answer to 4 decimal places.)

QUESTION 11

1. PCs: What do you decide?

   		P > α so fail to reject H0
   		P < α so reject H0
   		P < α so fail to reject H0
   		P > α so reject H0

  

QUESTION 12

1. PC: Which is the correct conclusion for the test?

   		There is enough evidence to reject the claim that fewer than 30% have a PC at home.
   		There is not enough evidence to reject the claim that fewer than 30% have a PC at home.
   		There is enough evidence to support the claim that fewer than 30% have a PC at home.
   		There is not enough evidence to support the claim that fewer than 30% have a PC at home.

Answer 1