Homework Answers
Note that, the unbiased point estimate of population mean is infact the sample mean.
So no matter what the confidence level is, the point estimate doesn't change. The confidence interval changes but not the point estimate.
Add Answer to:
Question 32 (1 point) A random sample of 40 students has a test score with sample...
(4)Five hundred students from a local high school took a college entrance examination. Historical data from the school record show that the standard deviation of test scores is 40. A random sampl...
(4)Five hundred students from a local high school took a college entrance examination. Historical data from the school record show that the standard deviation of test scores is 40. A random sample of thirty- six students is taken from the entire population of 500 students. The mean test score for the sample is three hundred eighty. Find (a) 95% confidence interval for the unknown population mean test score. (b) 95% confidence interval for the unknown population mean test score if...
A random sample of 225 exams score drawn from a large population of students has a...
A random sample of 225 exams score drawn from a large population of students has a mean of 60 and a sample standard deviation of 9. Estimate the population mean with a confidence level of 95%. _______< mean<________ Estimate the population mean with a confidence level of 98%. _______ <mean <________ Your final answers should be correct to 4 places after the decimal point. For a confidence level of 95% assuming the same statistics find the sample size that would...
QUESTION 1 In constructing a 95% confidence level estimate of the mean when the population standard...
QUESTION 1 In constructing a 95% confidence level estimate of the mean when the population standard deviation () is known what will be your score used in the formula? QUESTION 2 In constructing a 99% confidence level estimate of the mean when the population standard deviation (a) is known what will be your score used in the formula? HINT. Be sure to review page 236 "Finding Z scores from Known Areas - Special Cases and Tabel A-2. QUESTION 3 In...
A random sample of 65 high school students has a normal distribution. The sample mean average...
A random sample of 65 high school students has a normal distribution. The sample mean average ACT exam score was 21.4 with a 3.2 sample standard deviation. Construct a 90% confidence interval estimate of the population mean average ACT exam.
9. A simple random sample of 37 weights of pennies made after 1983 has a sample...
9. A simple random sample of 37 weights of pennies made after 1983 has a sample mean of 2.4991 g and a known population standard deviation of 0.0165 g. a. Construct a 99% confidence interval estimate of the mean weight of all such pennies. b. Design specifications require a population mean of 2.5 g. What does the confidence interval suggest about the manufacturing process? 10. A random sample of 40 students has a mean annual earnings of $3120 and a...
2. Suppose that a random sample of 41 state college students is asked to measure the...
2. Suppose that a random sample of 41 state college students is asked to measure the length of their right foot in centimeters. A 90% confidence interval for the mean foot length for students at this university turns out to be (21.709, 25.091). If we now calculated a 95% confidence interval, would the new confidence interval be wider than or narrower than or the same as the original? b. Suppose two researchers want to estimate the proportion of American college...
A random sample of 115 students has a test score average of 78 with a standard...
A random sample of 115 students has a test score average of 78 with a standard deviation of 10.3. Find the margin of error if the confidence level is 0.99. (Round answer to two decimal places)
a simple random sample of 26 college students showed a mean credit score of 575 and...
a simple random sample of 26 college students showed a mean credit score of 575 and a standard deviation 10. construct the 90% confidence interval estimate of the mean credit score for all college students a. state the critical value b. compute the margin of error c. state the confidence interval
(Test on a Mean, Sigma Unknown): A random sample of 12 first-year university students enrolled in...
(Test on a Mean, Sigma Unknown): A random sample of 12 first-year university students enrolled in MATH 1051H was drawn. At the course's completion, each student was asked how many hours he or she spent doing homework in statistics. The data are listed below. (28, 36, 38, 37, 32,36), (31, 31, 40, 40, 41, 36) You estimate that the population standard deviation is 7. The instructor has recommended that students devote 3 hours per week for the duration of the...
A sample of 36 randomly selected students has a mean test score of 83.4 with a...
A sample of 36 randomly selected students has a mean test score of 83.4 with a standard deviation of 8.92. Assume the population has a normal distribution. Find the margin of error, and then find the 95% confidence interval for the population mean.
(4)Five hundred students from a local high school took a college entrance examination. Historical data from the school record show that the standard deviation of test scores is 40. A random sample of thirty- six students is taken from the entire population of 500 students. The mean test score for the sample is three hundred eighty. Find (a) 95% confidence interval for the unknown population mean test score. (b) 95% confidence interval for the unknown population mean test score if...
QUESTION 1 In constructing a 95% confidence level estimate of the mean when the population standard deviation () is known what will be your score used in the formula? QUESTION 2 In constructing a 99% confidence level estimate of the mean when the population standard deviation (a) is known what will be your score used in the formula? HINT. Be sure to review page 236 "Finding Z scores from Known Areas - Special Cases and Tabel A-2. QUESTION 3 In...
2. Suppose that a random sample of 41 state college students is asked to measure the length of their right foot in centimeters. A 90% confidence interval for the mean foot length for students at this university turns out to be (21.709, 25.091). If we now calculated a 95% confidence interval, would the new confidence interval be wider than or narrower than or the same as the original? b. Suppose two researchers want to estimate the proportion of American college...
Most questions answered within 3 hours.
-
T
F 53) Most differences
between human groups are the result of biology rather than
culture....
asked 24 seconds from now -
A 5.20 mW helium neon laser emits a visible laser beam with a
wavelength of 633...
asked 2 minutes ago -
Assignment:
Your
organization has made a strategic decision
to
outsourcework
currently performed in house. You have...
asked 1 minute ago -
A hospital performs 100 surgeries per week. The probability that
complications after surgery occur is 10%....
asked 2 minutes ago -
In preparing its cash flow statement for the year ended December
31, 2018, Green Co. gathered...
asked 3 minutes ago -
Donna is 18 years old and full time accounting student.She is
saving for an overseas holiday...
asked 4 minutes ago -
Service-oriented architectures (SOA) provide
object-oriented architectures for web platforms that represent a
collection of services. SOA...
asked 4 minutes ago -
Le Terroir Winery is considering an expansion project to produce
fine wines. The trial expansion will...
asked 13 minutes ago -
The Bahraini public budget experiences deficit in the last
seven years, what are procedures are taken...
asked 20 minutes ago -
You invested $30,000 in a mutual fund at the beginning of the
year when the NAV...
asked 24 minutes ago -
Would you expect the price elasticity of supply for guitars to
be more inelastic in the...
asked 26 minutes ago -
A snowmobile is originally at the point with position vector
30.1 m at 95.0° counterclockwise from...
asked 26 minutes ago