I have a question about confidence interval and z - score. 1/ What conclusion can you...
I have a question about confidence interval and z - score.
1/ What conclusion can you draw from comparing 2 ( or more ) sets of data using confidence interval ? ( Ex: Data 1 and 2 about profit from each trade in stock market )
2/ What conclusion can you draw from comparing 2 ( or more ) sets of data using z-score ? ( Same example as above )
Homework Answers
1. When you compare two data sets using a confidence interval, you can compare with absolute values/ measures of the data points, and you can easily see what data points lie in the given confidence interval
2. If you are comparing two data sets using z score values, you can only see which one is more near to mean. but, you cannot compare then absolute values
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I have a question about confidence interval and z - score.
1/ What conclusion can you...
What is the z-score multiplier to make a 2-sided 95% confidence interval? (this is the value...
What is the z-score multiplier to make a 2-sided 95% confidence interval? (this is the value you look up in the standard normal table - enter your answer with 2 decimal places)? What is the z-score multiplier used to make a 1-sided 95% confidence interval? (this is the value you look up in the standard normal table - enter your answer with 2 decimal places)?
Is JMP using a Z or T score for the confidence interval ? How would you...
Is JMP using a Z or T score for the confidence interval ?
How would you ensure that Z score (or t) was used ?
Format Painter Clipboard Font st Confidence Intervals Parameter Estimate Lower CI Upper Cl 1-Alpha Mean19.40222 17.53517 21.26927 0.950 Std Dev 8.335516 7.207829 9.884799 0.950
For a certain law school, the entering students have an average LSAT score of about 700...
For a certain law school, the entering students have an average LSAT score of about 700 with a standard deviation of about 40. The smoothed density histogram of the LSAT scores appears to follow a normal distribution. Sketch a smoothed density histogram (a bell-shaped curve) of the distributions for the LSAT scores. (For this problem, draw this on your own paper. You will not need to submit this graph.) Because this distribution is approximately normal, the mean is equal to...
1. What is a confidence-interval estimate of a parameter? Why is such an estimate superior to...
1. What is a confidence-interval estimate of a parameter? Why is such an estimate superior to a point estimate? 2. Describe when you would use a t-score instead of a z-score when finding a confidence interval. 3. Suppose you want to increase the level of confidence without reducing the precision. What can you do? Thanks in advance!
33. Find the z-score used in the formula to construct a 92% confidence interval for a...
33. Find the z-score used in the formula to construct a 92% confidence interval for a population proportion: O a. 1.4051 Ob. 1.5548 Oc. 1.7507 Od. 1.96 34. All of the following are TRUE about 95% confidence intervals for a population mean except ::* O a. The population mean may or may not be in the confidence interval. Ob. The value of T varies depending on sample size. Oc. If the sample size is large, the Central Limit Theorem says...
1. A C level confidence interval is described as what? (3 points) Oan interval computed from...
1. A C level confidence interval is described as what? (3 points) Oan interval computed from a data sample by a method that has the probability C of producing an interval containing the true value of the parameter any interval within the margin of error O an interval with a margin of error C that is also correct C% of the time Oany interval that follows the 68-95-99.7 rules Oan interval computed from a data sample that guarantees that the...
Which of the following statements about confidence intervals is correct? A The value of z* you...
Which of the following statements about confidence intervals is correct? A The value of z* you use when constructing a confidence interval will affect where the center of the interval is. B If you construct a confidence interval for a population proportion and the interval ends up being from 0.20 to 0.40, this means the population proportion is definitely between 0.20 and 0.40. C A confidence interval is an interval of values computed from sample data that is likely to...
1. Use the given degree of confidence and sample data to construct a confidence interval for...
1. Use the given degree of confidence and sample data to construct a confidence interval for the point) population proportion p. A survey of 865 voters in one state reveals that 408 favor approval of an issue before the legislature. Construct the 95% confidence interval for the true proportion of all voters in the state who favor approval. 0 0.438<p0.505 0 0.444 p0.500 0 0.435<p<0.508 O 0.471 p0.472 2. Use the given data to find the minimum sample size required...
Confidence Interval about a Population Mean 2) Consider the same information as in Example 2 on...
Confidence Interval about a Population Mean 2) Consider the same information as in Example 2 on page 320, section 7.2, but use the following summary values instead: the sample size to be n = 15, the sample mean i = 30.2, and the sample standard deviation s = 2.40. The given summary statistics resulted from the raw data: 31, 29, 31, 26, 31, 32, 35, 28, 30, 27, 29, 29, 30, 32, and 34. Write your solution just like in...
what i currently have is wrong...thanks in advance! A 95% confidence interval for a population proportion...
what i currently have is wrong...thanks in advance!
A 95% confidence interval for a population proportion was constructed using a sample proportion from a random sample. Which of the following statements are correct? Select all that apply If we were to use a 90% confidence level, the confidence interval from the same data would produce an interval wider than the 95% confidence interval. There is a 95% chance that the 95% confidence interval actually contains the population proportion. We don't...
Is JMP using a Z or T score for the confidence interval ?
How would you ensure that Z score (or t) was used ?
Format Painter Clipboard Font st Confidence Intervals Parameter Estimate Lower CI Upper Cl 1-Alpha Mean19.40222 17.53517 21.26927 0.950 Std Dev 8.335516 7.207829 9.884799 0.950
33. Find the z-score used in the formula to construct a 92% confidence interval for a population proportion: O a. 1.4051 Ob. 1.5548 Oc. 1.7507 Od. 1.96 34. All of the following are TRUE about 95% confidence intervals for a population mean except ::* O a. The population mean may or may not be in the confidence interval. Ob. The value of T varies depending on sample size. Oc. If the sample size is large, the Central Limit Theorem says...
1. A C level confidence interval is described as what? (3 points) Oan interval computed from a data sample by a method that has the probability C of producing an interval containing the true value of the parameter any interval within the margin of error O an interval with a margin of error C that is also correct C% of the time Oany interval that follows the 68-95-99.7 rules Oan interval computed from a data sample that guarantees that the...
1. Use the given degree of confidence and sample data to construct a confidence interval for the point) population proportion p. A survey of 865 voters in one state reveals that 408 favor approval of an issue before the legislature. Construct the 95% confidence interval for the true proportion of all voters in the state who favor approval. 0 0.438<p0.505 0 0.444 p0.500 0 0.435<p<0.508 O 0.471 p0.472 2. Use the given data to find the minimum sample size required...
Confidence Interval about a Population Mean 2) Consider the same information as in Example 2 on page 320, section 7.2, but use the following summary values instead: the sample size to be n = 15, the sample mean i = 30.2, and the sample standard deviation s = 2.40. The given summary statistics resulted from the raw data: 31, 29, 31, 26, 31, 32, 35, 28, 30, 27, 29, 29, 30, 32, and 34. Write your solution just like in...
what i currently have is wrong...thanks in advance!
A 95% confidence interval for a population proportion was constructed using a sample proportion from a random sample. Which of the following statements are correct? Select all that apply If we were to use a 90% confidence level, the confidence interval from the same data would produce an interval wider than the 95% confidence interval. There is a 95% chance that the 95% confidence interval actually contains the population proportion. We don't...
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