Prob and Stat Ch 6 Review

Find the critical value for c = 0.95 and n = 15

• 1.781

• 2.145

• 2.131

• 2.101

A random sample of 120 students has a grade point average with a standard deviation of 0.6. Find the margin of error if c = 0.90

• 0.01

• 0.89

• 0.10

• 0.09

A survey of 800 non-fatal accidents showed that 373 involved the use of a cell phone. Construct a 98% confidence interval for the proportion of non-fatal accidents that involved the use of a cell phone.

• (0.43, 0.51)

• (0.47, 0.53)

• (0.25, 0.75)

• .04

A random sample of 85 tudents has a test score average with a standard deviation of 5.5. Find the margin of error if c=0.95

• .13

• 1.96

• 1.17

• 1.22

A random sample of 120 students has a grade point average with a mean of 3.0 and with a standard

     deviation of 0.75.  Construct the confidence interval for the population mean, if c = 0.98.

• .16

• (2.75, 3.25)

• (2.82, 3.18)

• (2.84, 3.16)

A random sample of 62 fluorescent light bulbs has a mean life of 705 hours with a standard deviation

     of 25 hours.  Construct a 90% confidence interval for the population mean.

 

 

• (699.76, 710.24)

• 5.24

• (699.78, 710.24)

• 1.65

A random sample of 62 fluorescent light bulbs has a mean life of 705 hours with a standard deviation

     of 25 hours.  Find the margin of error if c = 0.90

 

 

• (699.76, 710.24)

• 5.24

• (699.78, 710.24)

• 1.65

Find the value of E, the margin of error, for c = 0.95, n = 18 and s = 2.5.

• 1.96

• 2.110

• 1.24

• 1.25

When 500 college students were surveyed, 310 said they have to work to pay for tuitioin  Find the margin of error used to construct a 90% confidence interval.

 

• 0.33

• 0.04

• 0.67

• 0.09

Construct a 90% confidence interval for the population mean, μ. Assume the population has a normal

      distribution. A sample of 10 randomly selected students has a grade point average of 3.71 with a

      standard deviation of 0.62.

• 1.833

• (2.32, 2.57)

• (3.35, 4.07)

• (2.06, 2.58)