1) different video games showing druguse were observed. The duration times of druguse (in seconds) were recorded. When using this sample for a t test of the claim that the population mean is greater than 73 sec, what does dfdenote, and what is itsvalue?

What does dfdenote?

A.

The sample standard deviation

Your answer is not correct.

B.

The sample size

C.

The test statistic

D.

The number of degrees of freedom

This is the correct answer.

The value of df is

12

2)Use technology to find theP-value for the hypothesis test described below.

The claim is that for a smartphonecarrier's data speeds atairports, the mean is =12.00 Mbps. The sample size is n=17 and the test statistic is t=2.516.

P-value=

nothing

(Round to three decimal places asneeded.)

3)The display provided from technology available below results from using data for a smartphonecarrier's data speeds at airports to test the claim that they are from a population having a mean less than 5.00 Mbps. Conduct the hypothesis test using these results. Use a 0.05 significance level. Identify the null and alternativehypotheses, teststatistic, P-value, and state the final conclusion that addresses the original claim.

LOADING...

Click the icon to view the display from technology.

Assuming all conditions for conducting a hypothesis test aremet, what are the null and alternativehypotheses?

A.

H0: <5.00 Mbps

H1: =5.00 Mbps

B.

H0: =5.00 Mbps

H1: 5.00 Mbps

C.

H0: =5.00 Mbps

H1: <5.00 Mbps

D.

H0: =5.00 Mbps

H1: >5.00 Mbps

4)A data set includes data from 500 random tornadoes. The display from technology available below results from using the tornado lengths(miles) to test the claim that the mean tornado length is greater than 2.5 miles. Use a 0.05 significance level. Identify the null and alternativehypotheses, teststatistic, P-value, and state the final conclusion that addresses the original claim.

LOADING...

Click the icon to view the display from technology.

Assuming all conditions for conducting a hypothesis test aremet, what are the null and alternativehypotheses?

A.

H0: =2.5 miles

H1: >2.5 miles

B.

H0: <2.5 miles

H1: =2.5 miles

C.

H0: =2.5 miles

H1: 2.5 miles

D.

H0: =2.5 miles

5)A data set about speed dating includes"like" ratings of male dates made by the female dates. The summary statistics are n=191, x=5.54, s=1.94. Use a 0.01 significance level to test the claim that the population mean of such ratings is less than 6.00. Assume that a simple random sample has been selected. Identify the null and alternativehypotheses, teststatistic, P-value, and state the final conclusion that addresses the original claim.

What are the null and alternativehypotheses?

A.

H0: =6.00

H1: <6.00

B.

H0: =6.00

H1: 6.00

C.

H0: =6.00

H1: >6.00

D.

H0: <6.00

H1: >6.00

Click to select your answer and then click Check Answer.

6)

In a test of the effectiveness of garlic for loweringcholesterol, 36 subjects were treated with raw garlic. Cholesterol levels were measured before and after the treatment. The changes(before minusafter) in their levels of LDL cholesterol(in mg/dL) have a mean of 0.3 and a standard deviation of 22.9. Use a 0.05 significance level to test the claim that with garlictreatment, the mean change in LDL cholesterol is greater than 0. What do the results suggest about the effectiveness of the garlictreatment? Assume that a simple random sample has been selected. Identify the null and alternativehypotheses, teststatistic, P-value, and state the final conclusion that addresses the original claim.

What are the null and alternativehypotheses?

A.

H0: =0 mg/dL

H1: >0 mg/dL

B.

H0: >0 mg/dL

H1: <0 mg/dL

7)A data set lists earthquake depths. The summary statistics are n=500, x=5.45 km, s=4.88 km. Use a 0.01 significance level to test the claim of a seismologist that these earthquakes are from a population with a mean equal to 5.00. Assume that a simple random sample has been selected. Identify the null and alternativehypotheses, teststatistic, P-value, and state the final conclusion that addresses the original claim.

What are the null and alternativehypotheses?

A.

H0: 5.00 km

H1: =5.00 km

B.

H0: =5.00 km

H1: <5.00 km

C.

H0: =5.00 km

H1: >5.00 km

D.

H0: =5.00 km

H1: 5.00 km

8)8.3.22-TQuestion Help

A group of students estimated the length of one minute without reference to a watch orclock, and the times(seconds) are listed below. Use a 0.10 significance level to test the claim that these times are from a population with a mean equal to 60 seconds. Does it appear that students are reasonably good at estimating oneminute?

79

91

51

77

49

30

69

69

73

55

70

82

100

99

77

Assuming all conditions for conducting a hypothesis test aremet, what are the null and alternativehypotheses?

A.

H0: =60 seconds

H1: <60 seconds

B.

H0: =60 seconds

H1: 60 seconds

C.

H0: 60 seconds

H1: =60 seconds

D.

H0: =60 seconds

H1: >60 seconds