Homework Answers
H0: p = 0.9
Ha: p 
0.9 850
Sample proportion 
= 850 / 1000 = 0.850
Test statistics
z =(
- p) / sqrt(p(1-p))/ n
= (0.850 - 0.9) / sqrt(0.9 * 0.1/ 10000)
= -5.27
p-value = 2 * P(Z < z)
= 2 * P(Z < -5.27)
= 2 * 0.0
= 0.0000
Add Answer to:
Question 4 Suppose that 1000 customers are surveyed and 850 are satisfied or very satisfied with...
SHOW ALL WORK AND CLEARLY SHOW ANSWERS FOR A AND B! Name: 1. Suppose that 1000...
SHOW ALL WORK AND CLEARLY SHOW ANSWERS FOR A AND B!
Name: 1. Suppose that 1000 customers are surveyed and 850 are satisfied or very satisfied with a corporation's products and services. You want to test the hypothesis Ho: p = 0.9 against H:p 70.9 at the significance level of 0.05. (a) Find the critical region and make a decision. (b) Calculate the P-value for this test and make a decision.
4. The proportion of customers who are completely satisfied in a recent satisfaction survey of 300...
4. The proportion of customers who are completely satisfied in a recent satisfaction survey of 300 customers at XYC Inc. is found to be 0.26. (6 points) a. Test the hypothesis that the population proportion of customers who are completely satisfied is greater than 0.22 using the critical value approach and a 0.05 level of significance. b. Test the hypothesis that the population proportion of customers who are completely satisfied is less than 0.30 using the p-value approach and a...
The CEO of a large electric utility claims that 80 percent of his 1,000,000 customers are...
The CEO of a large electric utility claims that 80 percent of his 1,000,000 customers are very satisfied with the service they receive. To test this claim, the local newspaper surveyed 100 customers using simple random sampling to determine if the proportion differs from 80%. Among the sampled customers, 73 say they are very satisfied. Based on these findings, can we reject the CEO's hypothesis that 80% of the customers are very satisfied? Use a 0.05 level of significance. a)...
Recall that "very satisfied" customers give the XYZ-Box video game system a rating that is at...
Recall that "very satisfied" customers give the XYZ-Box video game system a rating that is at least 42. Suppose that the manufacturer of the XYZ-Box wishes to use the random sample of 63 satisfaction ratings to provide evidence supporting the claim that the mean composite satisfaction rating for the XYZ-Box exceeds 42. (a) Letting µ represent the mean composite satisfaction rating for the XYZ-Box, set up the null hypothesis H0 and the alternative hypothesis Ha needed if we wish to...
Recall that "very satisfied" customers give the XYZ-Box video game system a rating that is at...
Recall that "very satisfied" customers give the XYZ-Box video game system a rating that is at least 42. Suppose that the manufacturer of the XYZ-Box wishes to use the random sample of 70 satisfaction ratings to provide evidence supporting the claim that the mean composite satisfaction rating for the XYZ-Box exceeds 42. (a) Letting µ represent the mean composite satisfaction rating for the XYZ-Box, set up the null hypothesis H0 and the alternative hypothesis Ha needed if we wish to...
Consider the hypothesis test Ho : 67 = oz against H, : 67 +0. Suppose the...
Consider the hypothesis test Ho : 67 = oz against H, : 67 +0. Suppose the sample sizes are ni = 16 and n2 = 21 and the sample standard deviations are si = 1.7 and $2 = 1.3. Use a = 0.05. a) Test the hypothesis. Find the P-value. Round your answer to three decimal places (e.g. 9.876). p-value = Ho b) Construct a 95% two-sided confidence interval of oʻrelations. Round your answers to two decimal places (e.g. 9.87).
Suppose that you were trying to determine if the population proportion of Americans that currently believe...
Suppose that you were trying to determine if the population proportion of Americans that currently believe that nuclear power is extremely/very dangerous to the environment was less than 50%. You decide to test the null hypothesis Ho: p = 0.50 versus Ha: p < 0.50. In 2010, the General Social Survey included a question that asked its participants if they felt that nuclear power plants were extremely/very dangerous to the environment. Out of the 1340 surveyed, 634 said yes. What...
9.2.8-T Question Help A sporting goods store believes the average age of its customers is 39...
9.2.8-T Question Help A sporting goods store believes the average age of its customers is 39 or less. A random sample of 40 customers was surveyed, and the average customer age was found to be 41.8 years. Assume the standard deviation for customer age is 9.0 years. Using c 0.01, complete parts a and below. a. Does the sample provide enough evidence to refute the age claim made by the sporting goods store? Determine the null and alternative hypotheses. Determine...
In 1944, an organization surveyed 1100 adults and asked, "Are you a total abstainer from, or...
In 1944, an organization surveyed 1100 adults and asked, "Are you a total abstainer from, or do you on occasion consume, alcoholic beverages?" Of the 1100 adults surveyed, 440 indicated that they were total abstainers. In a recent survey, the same question was asked of 1100 adults and 407 indicated that they were total abstainers. Complete parts (a) and (b) below. Find the test statistic for this hypothesis test. (Round to two decimal places as needed.) Determine the P-value for...
Given a normally distributed population with known standard deviation of o = 4, and suppose we...
Given a normally distributed population with known standard deviation of o = 4, and suppose we would like to test Hair = 14 against H.:p> 14 and significance level a = .05 a) If the null hypothesis is true, what is the probability that we would reject it in favor of the alternative hypothesis? b) Taking a random sample of n= 10 from the population and find that the sample mean is a 16.5. Give the observed value z of...
SHOW ALL WORK AND CLEARLY SHOW ANSWERS FOR A AND B!
Name: 1. Suppose that 1000 customers are surveyed and 850 are satisfied or very satisfied with a corporation's products and services. You want to test the hypothesis Ho: p = 0.9 against H:p 70.9 at the significance level of 0.05. (a) Find the critical region and make a decision. (b) Calculate the P-value for this test and make a decision.
4. The proportion of customers who are completely satisfied in a recent satisfaction survey of 300 customers at XYC Inc. is found to be 0.26. (6 points) a. Test the hypothesis that the population proportion of customers who are completely satisfied is greater than 0.22 using the critical value approach and a 0.05 level of significance. b. Test the hypothesis that the population proportion of customers who are completely satisfied is less than 0.30 using the p-value approach and a...
Consider the hypothesis test Ho : 67 = oz against H, : 67 +0. Suppose the sample sizes are ni = 16 and n2 = 21 and the sample standard deviations are si = 1.7 and $2 = 1.3. Use a = 0.05. a) Test the hypothesis. Find the P-value. Round your answer to three decimal places (e.g. 9.876). p-value = Ho b) Construct a 95% two-sided confidence interval of oʻrelations. Round your answers to two decimal places (e.g. 9.87).
9.2.8-T Question Help A sporting goods store believes the average age of its customers is 39 or less. A random sample of 40 customers was surveyed, and the average customer age was found to be 41.8 years. Assume the standard deviation for customer age is 9.0 years. Using c 0.01, complete parts a and below. a. Does the sample provide enough evidence to refute the age claim made by the sporting goods store? Determine the null and alternative hypotheses. Determine...
In 1944, an organization surveyed 1100 adults and asked, "Are you a total abstainer from, or do you on occasion consume, alcoholic beverages?" Of the 1100 adults surveyed, 440 indicated that they were total abstainers. In a recent survey, the same question was asked of 1100 adults and 407 indicated that they were total abstainers. Complete parts (a) and (b) below. Find the test statistic for this hypothesis test. (Round to two decimal places as needed.) Determine the P-value for...
Given a normally distributed population with known standard deviation of o = 4, and suppose we would like to test Hair = 14 against H.:p> 14 and significance level a = .05 a) If the null hypothesis is true, what is the probability that we would reject it in favor of the alternative hypothesis? b) Taking a random sample of n= 10 from the population and find that the sample mean is a 16.5. Give the observed value z of...
Most questions answered within 3 hours.
-
Where is the error in this code sequence?
String s1 = "Hello";
String s2 = "ello";...
asked 11 months ago -
Financial data for Joel de Paris, Inc., for last year
follow:
Joel de Paris, Inc.
Balance...
asked 11 months ago -
Consider this reaction:
Al2(SO4)3 (aq)+ BaCl3
(aq) Al2Cl6 (aq)- +
3BaSO4(s) . What is the...
asked 11 months ago -
Suppose that Savneet is considering increasing her
recent random sample from 20 car rentals to 40...
asked 11 months ago -
Trucks arrive at an unloading terminal at an average rate of 120
per hour.
Trucks arrive...
asked 11 months ago -
Why are methanol and ethanol completely soluble in water while
octanol is not very little soluble....
asked 11 months ago -
A facilities manager at a university reads in a research report
that the mean amount of...
asked 11 months ago -
When the CuSO4 is rehydrated by adding water to the anhydrous
compound, is this an endothermic...
asked 11 months ago -
A ray of sunlight is passing from diamond into crown glass; the
angle of incidence is...
asked 11 months ago -
A block of mass 0.249 kg is placed on top of a light, vertical
spring of...
asked 11 months ago -
how do the kidneys compensate in the presences of acidosis
a) trigger hyperventilate
b) reserve acid...
asked 11 months ago -
Question 501 pts
The rental rate of capital to the firm increases. Which of the
following...
asked 11 months ago