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1) 29% of college students...

1) 29% of college students say they use credit cards because of the rewards program. you randomly select 10 college students and ask each to name the reason he or she uses credit cards. Find the probability of the number of college students that use the credit card because of the rewards program is (a) exactly two, (b) more than two,(c) between two and five inclusive.

2) you interview a random sample of 50 adults. The results of the survey show that 37% of adults say they were more likely to buy a product when there are free samples. At a= 0.01, can you reject the claim that at least 51% of the adults are more likely to buy a product when there are free samples?

(a)State the null and alternative hypothesis.

(b)The critical values is/are?

(c)z=

(d)What is the result of the test?

3)Write the null and alternative hypothesis. Identify which is the claim.

The results of a recent study show that the proportion of people who use seat belts when riding in a car or truck is 77%

4)A soccer ball manufacturer wants to estimate the mean circumference of soccerballs within 0.05 in.

(a) Determine the minimum sample size required to construct 99% confidence interval for the population mean. assume the population standard deviation is 0.20 in.

(b) repeat part (a) using a standard deviation of 0.30 in.

(c) Which standard deviation requires a larger sample size?

5)The mean incubation time for a type of fertilized egg kept at 100.7 F is 23 days. Suppose the incubation times are approximately normal distributed with a standard deviation of 2 days.

(a) what is the probability that a randomly selected fertilized egg hatches in less than 19days?

(b)what is the probability that a randomly selected fertilized egg hatches between 21 and 23 days?

(c)what is the probability that a randomly selected fertilized egg takes over 27 days to hatch?

6)What is the sample size of these numbers below?

101

70.25

92

159

109

147.75

124.25

111.75

129.75

99.50

117

skip 7)

8)find the indicated probability using the standard normal distribtion

P(z>-0.69)=

9)Is age of a car driven qualitative or quantitative?

10)"Budget, x","Gross, y"

206,527

202,438

200,1881

199,833

182,740

173,266

173,274

169,410

(a) what does this scatter point graph look like for this data above?

(b)Calculate the correlation coefficient of r. r=

(c) the correlation is a ________ linear correlation?

11)Given that x has a poisson distribution with u=0.7, what is the probability that x=4?

12)A researcher wishes to estimate a with 90% confidence, the proportion of adults who have high speed internet access. Her estimate must be accurate within 2% of the true proportion.

(a) find the minimum sample size needed, using a prior study that found 54% of the respondants say they have high speed internet access.

(b)find the minimum sample size needed if no preliminary estimate is available.

13)To determine her blood pressure , Miranda devides up her day into three parts:morning, afternoon, evening. She then checks her blood pressure at 2 randomly selected times during each part of the day.

What type of sampling is used?

14)The state scores for 12 randomly selected high school seniors are listed below. Assume the population is normal distributed.

1424

1223

984

699

729

840

729

748

545

624

1449

949

(a)Find the sample mean

(b)Find the sample standard deviation

(c)A 95% confidence interval for the population mean is?

15)skip

16)A random sample of fifty-three 200 meter swims has a mean time of 3.17 minutes and a standard deviation of 0.06 minutes. construct a 95% confidence interval for the population mean time.

(a) the 95% confidence interval is ? (__,__)

2) you interview a random sample of 50 adults. The results of the survey show that 37% of adults say they were more likely to buy a product when there are free samples. At a= 0.01, can you reject the claim that at least 51% of the adults are more likely to buy a product when there are free samples?

(a)State the null and alternative hypothesis.

(b)The critical values is/are?

(c)z=

(d)What is the result of the test?

3)Write the null and alternative hypothesis. Identify which is the claim.

The results of a recent study show that the proportion of people who use seat belts when riding in a car or truck is 77%

4)A soccer ball manufacturer wants to estimate the mean circumference of soccerballs within 0.05 in.

(a) Determine the minimum sample size required to construct 99% confidence interval for the population mean. assume the population standard deviation is 0.20 in.

(b) repeat part (a) using a standard deviation of 0.30 in.

(c) Which standard deviation requires a larger sample size?

5)The mean incubation time for a type of fertilized egg kept at 100.7 F is 23 days. Suppose the incubation times are approximately normal distributed with a standard deviation of 2 days.

(a) what is the probability that a randomly selected fertilized egg hatches in less than 19days?

(b)what is the probability that a randomly selected fertilized egg hatches between 21 and 23 days?

(c)what is the probability that a randomly selected fertilized egg takes over 27 days to hatch?

6)What is the sample size of these numbers below?

101

70.25

92

159

109

147.75

124.25

111.75

129.75

99.50

117

skip 7)

8)find the indicated probability using the standard normal distribtion

P(z>-0.69)=

9)Is age of a car driven qualitative or quantitative?

10)"Budget, x","Gross, y"

206,527

202,438

200,1881

199,833

182,740

173,266

173,274

169,410

(a) what does this scatter point graph look like for this data above?

(b)Calculate the correlation coefficient of r. r=

(c) the correlation is a ________ linear correlation?

11)Given that x has a poisson distribution with u=0.7, what is the probability that x=4?

12)A researcher wishes to estimate a with 90% confidence, the proportion of adults who have high speed internet access. Her estimate must be accurate within 2% of the true proportion.

(a) find the minimum sample size needed, using a prior study that found 54% of the respondants say they have high speed internet access.

(b)find the minimum sample size needed if no preliminary estimate is available.

13)To determine her blood pressure , Miranda devides up her day into three parts:morning, afternoon, evening. She then checks her blood pressure at 2 randomly selected times during each part of the day.

What type of sampling is used?

14)The state scores for 12 randomly selected high school seniors are listed below. Assume the population is normal distributed.

1424

1223

984

699

729

840

729

748

545

624

1449

949

(a)Find the sample mean

(b)Find the sample standard deviation

(c)A 95% confidence interval for the population mean is?

15)skip

16)A random sample of fifty-three 200 meter swims has a mean time of 3.17 minutes and a standard deviation of 0.06 minutes. construct a 95% confidence interval for the population mean time.

(a) the 95% confidence interval is ? (__,__)

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