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1. A random sample of 20 students yielded a mean ofT 72 and a variance of s2 16 for scores on a c...
A random sample of 30 students yielded a mean of x(bar) = 72 and a variance...
A random sample of 30 students yielded a mean of x(bar) = 72 and a variance of s2 = 10 for scores on a college placement test in mathematics. Assuming the scores to be normally distributed, construct a 95% confidence interval for σ2. a. [6.34 < σ2 < 18.07] b. [7.38 < σ2 < 20.37] c. [6.72 < σ2 < 19.36] d. [7.61 < σ2 < 21.69]
Directions for Confidence Interval Problems: For Questions 1 to 3, include the following information in your...
Directions for Confidence Interval Problems: For Questions 1 to 3, include the following information in your solution: • Does your problem involve 1 population or 2 populations? . State a. • State whether you should use z or X2 • Find / provide the appropriate value (z or x2) from the table (or your calculator). Round z-values to 2 decimals, and round X2-values to 3 decimals. • Find the confidence interval. Round your final values to 3 decimals. • State...
6. A random sample of 18 students obtained a mean score of 82 and a variance...
6. A random sample of 18 students obtained a mean score of 82 and a variance of s2=16 on a college placement test in science. Assuming the scores to be normally distributed, construct a 90 percent confidence interval for variance, σ2.
please make sure you follow the 6 bullets points Directions for Confidence Interval Problems: For Questions...
please make sure you follow the 6 bullets points
Directions for Confidence Interval Problems: For Questions 1 to 4, include the following information in your solution: Does your problem involve 1 population or 2 populations? If you have 2 populations, should they be paired or not? State α. State whether you should use z or t and find provide the appropriate value from the table (or your calculator). Round -values to 2 decimals, and round t-values to 3 decimals. ....
please show how its done on TI-64 1. SAT scores are distributed with a mean of...
please show how its done on TI-64 1. SAT scores are distributed with a mean of 1,500 and a standard deviation of 300. You are interested in estimating the average SAT score of first year students at your college. If you would like to limit the margin of error of your 95% confidence interval to 25 points, how many students should you sample? 3. If n=31, ¯xx¯(x-bar)=36, and s=6, construct a confidence interval at a 98% confidence level. Assume the...
Question 16 1 pts A random sample of 56 fast food employees in a state yielded...
Question 16 1 pts A random sample of 56 fast food employees in a state yielded a mean hourly wage of $12.5. It is known that hourly wages in the state are normally distributed and the population standard deviation is $3.2. Build an 80% CI for the population mean hourly wage for fast food workers in the state. Keep three decimals in your Critical Value Zc, then round E to one decimal place before finding the endpoints of the interval....
Question 2 of 5, Step 1 of 4 4/20 Correct A state legislator wants to determine...
Question 2 of 5, Step 1 of 4 4/20 Correct A state legislator wants to determine whether his voters' performance rating (0 - 100) has changed from last year to this year. The following table shows the legislator's performance from the same ten randomly selected voters for last year and this year. Use this data to find the 98 % confidence interval for the true difference between the population means. Assume that the populations of voters' performance ratings are normally...
Listed in the data table are 10 scores for a random sample of subjects with medium...
Listed in the data table are 10 scores for a random sample of subjects with medium load levels in their blood. Also listed are statistics from a study done of IQ scores for a random sample of subjects with high lead levels. Assume that the two samples are independent simple random samples selected from normally distributed populations. Do not assume that the population standard deviations are equal. Complete parts (a) and (b) below. Use a 0.05 significance level for both...
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...
1. The admissions officer at a small college compares the scores on the Scholastic Aptitude Test...
1. The admissions officer at a small college compares the scores on the Scholastic Aptitude Test (SAT) for the school's male and female applicants. A random sample of 15 male applicants results in a SAT scoring mean of 1100 with a standard deviation of 53. A random sample of 5 female applicants results in a SAT scoring mean of 1218 with a standard deviation of 30. Using this data, find the 90% confidence interval for the true mean difference between...
Directions for Confidence Interval Problems: For Questions 1 to 3, include the following information in your solution: • Does your problem involve 1 population or 2 populations? . State a. • State whether you should use z or X2 • Find / provide the appropriate value (z or x2) from the table (or your calculator). Round z-values to 2 decimals, and round X2-values to 3 decimals. • Find the confidence interval. Round your final values to 3 decimals. • State...
please make sure you follow the 6 bullets points
Directions for Confidence Interval Problems: For Questions 1 to 4, include the following information in your solution: Does your problem involve 1 population or 2 populations? If you have 2 populations, should they be paired or not? State α. State whether you should use z or t and find provide the appropriate value from the table (or your calculator). Round -values to 2 decimals, and round t-values to 3 decimals. ....
Question 16 1 pts A random sample of 56 fast food employees in a state yielded a mean hourly wage of $12.5. It is known that hourly wages in the state are normally distributed and the population standard deviation is $3.2. Build an 80% CI for the population mean hourly wage for fast food workers in the state. Keep three decimals in your Critical Value Zc, then round E to one decimal place before finding the endpoints of the interval....
Question 2 of 5, Step 1 of 4 4/20 Correct A state legislator wants to determine whether his voters' performance rating (0 - 100) has changed from last year to this year. The following table shows the legislator's performance from the same ten randomly selected voters for last year and this year. Use this data to find the 98 % confidence interval for the true difference between the population means. Assume that the populations of voters' performance ratings are normally...
Listed in the data table are 10 scores for a random sample of subjects with medium load levels in their blood. Also listed are statistics from a study done of IQ scores for a random sample of subjects with high lead levels. Assume that the two samples are independent simple random samples selected from normally distributed populations. Do not assume that the population standard deviations are equal. Complete parts (a) and (b) below. Use a 0.05 significance level for both...
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...
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