Homework Answers
Answer:
The correct answer is B. The sample mean(M).
The center of a confidence interval is always a sample mean or sample proportion.
Hey, please do leave a thumbs-up, as it motivates us to do better. Thank you.
For any queries, hit comments!!!
Add Answer to:
Imagine that a researcher appropriately conducts a z test and then calculates a corresponding 95% confidence...
10. Properties of a confidence interval Suppose the mean of a population is 22. A researcher...
10. Properties of a confidence interval Suppose the mean of a population is 22. A researcher (who does not know that p Then she constructs a 95% confidence interval of the population mean. 22) selects a random sample of size n from this population. The true population mean and the researcher's 95% confidence interval of the population mean are shown in the following graph. Use the graph to answer the questions that follow Sample Mean 95% Confidence interval of the...
A furniture mover calculates the actual weight as a proportion of estimated weight for a sample...
A furniture mover calculates the actual weight as a proportion of estimated weight for a sample of 31 recent jobs. The sample mean is 1.13 and the sample standard deviation is 0.16. a) Calculate a 95% confidence interval for the population mean using t tables. b) Assume that the population standard deviation is known to be 0.16. Calculate a 95% confidence interval for the population mean using the z table. c) Are the 95% confidence intervals for the population mean,...
Confidence Interval Given. Assume I created a 95% confidence interval for the mean hours studied for...
Confidence Interval Given. Assume I created a 95% confidence interval for the mean hours studied for a test based on a random sample of 64 students. The lower bound of this interval was 4 and the upper bound was 14. Assume that when I created this interval I knew the population standard deviation. Using this information, (a) Calculate the width of the interval. (b) Calculate the margin of error for the interval. (c) Calculate the center of the interval. (d)...
Please answer this question.. A marketing researcher wants to find a 95% confidence interval for the...
Please answer this question..
A marketing researcher wants to find a 95% confidence interval for the mean amount that visitors to a theme park spend per person per day. She knows that the standard deviation of the amounts spent per person per day by all visitors to this park is $11. How large a sample should the researcher select so that the estimate will be within $2 of the population mean? 2,
A researcher is interested in finding a 95% confidence interval for the mean number minutes students...
A researcher is interested in finding a 95% confidence interval for the mean number minutes students are concentrating on their professor during a one hour statistics lecture. The study included 96 students who averaged 37.1 minutes concentrating on their professor during the hour lecture. The standard deviation was 13.6 minutes. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a distribution. b. With 95% confidence the population mean minutes of concentration is between and...
A researcher wishes to test the claim that for a particular manufacturer of cereal, the mean...
A researcher wishes to test the claim that for a particular manufacturer of cereal, the mean weight in its boxes of cereal is less than 18 ounces. A sample of 36 boxes yields a sample mean weight of 17.88 ounces. Assume that the population standard deviation is .28 ounces. Let a =.05. a. Conduct a 5-step test of hypotheses: i. H0: Ha: ii. a=_______. iii. Test Statistic (if a t test is used, also report the df): iv. P-value: v....
In class we had 41 95% confidence intervals that we believe to be calculated correctly. The...
In class we had 41 95% confidence intervals that we believe to be calculated correctly. The confidence intervals were collected by taking a sample of 60 data points from the population data. 41 of the confidence intervals appear to be calculated correctly. Of these 4 of them do not have the population mean inside the confidence interval. Based on a 95% confidence, we expected 2 to not contain the population mean. Did this happen by chance alone? To find your...
Confidence Intervals 9. Construct a 95 % confidence interval for the population mean, . In a...
Confidence Intervals 9. Construct a 95 % confidence interval for the population mean, . In a random sample of 32 computers, the mean repair cost was $143 with a sample standard deviation of $35 (Section 6.2) Margin of error, E. <με. Confidence Interval: O Suppose you did some research on repair costs for computers and found that the population standard deviation, a,- $35. Use the normal distribution to construct a 95% confidence interval the population mean, u. Compare the results....
After conducting an independent samples t-test, a researcher finds that the 95% confidence interval estimating the...
After conducting an independent samples t-test, a researcher finds that the 95% confidence interval estimating the difference between the treatment group and the control group is 2.37 ± 1.85. Which of the following is definitely true? Choose one of the 3 the choices. A. The effect size of the comparison between groups is 3.7. B. The mean of the treatment group is 2.37. C. The difference between groups is significant.
The U.S. Census Bureau conducts a study to determine the time needed to complete the short...
The U.S. Census Bureau conducts a study to determine the time needed to complete the short form. The Bureau surveys 200 people. The sample mean is 8.2 minutes, and the sample standard deviation is 2.2 minutes. To calculate a confidence interval for this data, would you use a value from the Z distribution or the t distribution? Write a sentence to explain your choice. (4 points) Calculate the 99% confidence interval for µ, the population mean time it takes to...
10. Properties of a confidence interval Suppose the mean of a population is 22. A researcher (who does not know that p Then she constructs a 95% confidence interval of the population mean. 22) selects a random sample of size n from this population. The true population mean and the researcher's 95% confidence interval of the population mean are shown in the following graph. Use the graph to answer the questions that follow Sample Mean 95% Confidence interval of the...
Please answer this question..
A marketing researcher wants to find a 95% confidence interval for the mean amount that visitors to a theme park spend per person per day. She knows that the standard deviation of the amounts spent per person per day by all visitors to this park is $11. How large a sample should the researcher select so that the estimate will be within $2 of the population mean? 2,
Confidence Intervals 9. Construct a 95 % confidence interval for the population mean, . In a random sample of 32 computers, the mean repair cost was $143 with a sample standard deviation of $35 (Section 6.2) Margin of error, E. <με. Confidence Interval: O Suppose you did some research on repair costs for computers and found that the population standard deviation, a,- $35. Use the normal distribution to construct a 95% confidence interval the population mean, u. Compare the results....
Most questions answered within 3 hours.
-
The Question: Cryptography is behind the scenes
of much of the security of the internet. These...
asked 2 hours ago -
Important Information to answer the question:
Scale Solar Power Energy
The average price of a 4KW...
asked 2 hours ago -
Lowell Corp. sells $100,000 of bonds to private investors. The
bonds are due in five years,...
asked 4 hours ago -
3) Do you believe that Disney’s
acquisition-based growth strategy is sustainable?
4) Which competencies support this...
asked 4 hours ago -
Rank the following three stocks by their total risk level highest
to lowest night writer has...
asked 4 hours ago -
A local
electronic company primarily manufactures four highly technical
telecommunication products. Each product must be processed...
asked 6 hours ago -
•Describe the basic structure of collagen monomers •Explain how
amino acid composition of collagen contributes to...
asked 7 hours ago -
Compute the sample correlation coefficient
r for each of the following data sets.
(Use 3 decimal...
asked 8 hours ago -
5a. What are the advantages and disadvantages of Proxy ARP?
b. What is the TTL field...
asked 8 hours ago -
An ice cube (density = 900[kg/m3]) with a side length of
2.54[cm] is held by a...
asked 9 hours ago -
would you say that leaders in the international context are born
or made? That is, can...
asked 10 hours ago -
Instructions
Read the Digital Trends article "Solid state drives are speedier
than hard disk drives. Are...
asked 10 hours ago