Please help me answer these.

The yield of a random sample of 20 farmers showed an average of 75 cavan and a

standard deviation of 3 cavan. Construct a 95% confidence interval for the

average yield of farmers.

15.Which of the following are you going to use in constructing

for the confidence interval?

Confidence Interval for a proportion

Confidence Interval for Variances and Standard Deviations

Confidence Interval of the Mean when is known

Confidence Interval of the Mean when is unknown

16.What will be the margin of error *

1.1598

1.3148

1.4040

1.2929

17.What will be the 95% confidence interval for the average

yield of farmers. *

73.5960 cavan to 76.4040 cavan

73.7071 cavan to 76.2929 cavan

73.6852 cavan to 76.3148 cavan

73.8402 cavan to 76.1598 cavan

The

owner of the AGT Gas Station wishes to determine the fraction of customers who

pay using a credit card or debit card. A random sample of 100 customers was

surveyed and finds that 80 paid using their credit card or debit card.

Construct a 99% confidence interval for the fraction of customers who paid

using their credit card or debit card.

18.Which of the following are you going to use in constructing

for the confidence interval? *

Confidence Interval for Variances and Standard Deviations

Confidence Interval of the Mean when is known

Confidence Interval of the Mean when is unknown

Confidence Interval for a proportion

19.What will be the margin of error? *

0.0658

0.0784

0.0299

0.103

20.What will be the 99% confidence interval for the fraction of

customers who paid using their credit card or debit card? *

69.70% to 90.30%

72.16% to 87.84%

77.10% to 82.99%

73.42% to 86.58%

21.A social worker wishes to estimate with 95% confidence the

average daily amount of time spent by a mother with her infant such that the

margin of error is 1 hr. In the past, it was determined that the standard

deviation of the daily times spent by mother with her infant is 2.5 hr. How

many mothers should the social worker interview? *

24

35

30

33

26.Assumption made about the population for the sole purpose of nullification *

Ha

Ho

Hi

27.Which of these statements reflect a null hypothesis? *

As temperature increases so too will the level of aggression

Older adults will have worse memories than younger adults

There will be a significant difference between group 1 and group 2

There will be no relationship between caffeine consumption and performance

28.Bob believes that his supermarket's prices are lower than Gab. To test the hypothesis of Bob, a list of identical items and purchase was constructed at their respective store every week for two months. What kind of test are you going to use to test the hypothesis of Bob? *

independent two sample t-test

paired t-test

one sample z-test

one sample t-test

29.It is known that for right-handed people, the dominant (right) hand tends to be stronger. For left-handed people who live in a world designed for right-handed people, the same may not be true. To test this, muscle strength was measured on the right and left hands of a random sample of 15 left-handed men and the difference (left - right) was found. This is an example of: *

paired t-test

one sample z-test

one sample t-test

independent two sample t-test

30.The fasting blood glucose levels of nine women who had been using oral contraceptives for at least 6 months prior to sampling are 4.71, 3.61, 4.92, 4.85, 4.66, 3.92, 5.10, 3.55 and 4.78. It is claimed that the mean fasting blood glucose level in women not using contraceptives is 3.8 mmol/l. The researcher used 0.05 level of significance and assume symmetry. What will be the appropriate statistical analysis to used? *

paired t-test

one sample z-test

one sample t-test

independent two sample t-test

The average monthly income of a sari-sari store owner is at most 6,500. A random sample of 35 sari-sari store owner was selected and it was found out that their mean monthly income was 6,000 with a standard deviation of 300. With =5%, can we conclude that the average monthly income of a sari-sari store owner is at most 6,500?

31.What will be the alternative hypothesis? *

The average monthly income of a sari-sari store owner is not 6,500.

The average monthly income of a sari-sari store owner is 6,500.

The average monthly income of a sari-sari store owner is greater than 6,500.

The average monthly income of a sari-sari store owner is less than 6,500.

32.Based on the alternative hypothesis, what is the appropriate test to used? *

two tailed

right tailed

three tailed

left tailed

33.What is the value of test statistic, Zc? *

-12.57

-9.86

-21.05

-11.23

34.What will be the decision? *

Reject Ho

Failed to Reject Ho

35.What will be the conclusion? *

There is no enough evidence to reject the claim that the average monthly income of a sari-sari store owner is at most 6,500.

There is enough evidence to reject the claim that the average monthly income of a sari-sari store owner is at most 6,500.

Smart phone manufacturer claims that 65% of teenagers 13 to 17 years have their own smart phone. A researcher wishes to test the claim and selects a random sample of 80 teenagers. The results showed that 60 out of 80 teenagers have their own smart phones. At 0.05 level of significance, should the claim be rejected?

36.What will be the alternative hypothesis? *

The proportion of teenagers having their own smart phone is less than 65%.

The proportion of teenagers having their own smart phone is not 65%.

The proportion of teenagers having their own smart phone is 65%.

The proportion of teenagers having their own smart phone is greater than 65%.

37.Based on the alternative hypothesis, what is the appropriate test to used? *

two tailed

right tailed

three tailed

left tailed

38.What is the value of test statistic, Zc? *

2.289

2.022

1.875

2.522

39.What will be the decision? *

Failed to Reject Ho

Reject Ho

40.What will be the conclusion? *

There is no enough evidence to reject the claim that 65% of teenagers 13 to 17 years have their own smart phone.

There is enough evidence to reject the claim that 65% of teenagers 13 to 17 years have their own smart phone.

An energy claims that the average wind speed of Region A is greater than that of Region B. To test the claim, the average wind speed is calculated for 15 days in each region. The results of the company's research are shown in the Table below. Use 0.05 level of significance to test the claim.

Sample Mean (Region A, 1)=13.2 mph,Sample Stdev (Region A, 1)=2.3 mph

Sample Mean (Region B, 2)=12.5 mph,Sample Stdev (Region B, 2)=2.7 mph

41.What will be the alternative hypothesis? *

"Region A's average wind speed is not equivalent to Region B's.

"Region A's average wind speed is equivalent to Region B's.

"Region A's average wind speed is greater than Region B's.

"Region A's average wind speed is less than Region B's.

42.Based on the alternative hypothesis, what is the appropriate test to used? *

right tailed

three tailed

left tailed

two tailed

43.What will be the value of test statistic, tc? *

0.764

2.575

1.960

0.598

44.What will be the decision? *

Reject Ho

Failed to reject Ho

45.What will be the conclusion? *

There is no enough evidence to support the claim that the average wind speed of Region A is greater than that of Region B.

There is enough evidence to support the claim that the average wind speed of Region A is greater than that of Region B.

The VP for Nursing Services at St. Anne's Memorial Hospital wants to know whether the variances of earnings for union and nonunion nurses are equal. Use the 0.10 significance level.

Sample Size (Union, 1)=10,Sample Stdev (Union, 1)=2.25

Sample Size (Nonunion, 2)=15,Sample Stdev (Nonunion, 2)=1.90

46.What is the appropriate test to use to test the claim. *

Z-test

t-test

^2-test

F-test

47.What will be the alternative hypothesis? *

Union nurses have higher variance that Nonunion nurses.

Union nurses have lower variance that Nonunion nurses.

Union and Nonunion nurse have unequal variances.

Union and Nonunion nurse have equal variances.

48.What will be the test value, F? *

1.402

1.184

0.8444

0.713

49.What will be the decision? *

Failed to reject Ho

Reject Ho

50.What will be the conclusion? *

Variances of Union and Nonunion are not equal.

Variances of Union and Nonunion are equal.