Homework Answers
E(X)
The expected value of random variable X
Population mean of random variable X
Mu
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Select all choices below that mean the same thing. You should select, at a minimum, two...
How many students (minimum possible) should be sampled if you want to estimate the true mean...
How many students (minimum possible) should be sampled if you want to estimate the true mean number of credit hours per student with an error of no more than 0.3 and 95% confidence. From a prior study, it is known that the standard deviation is 2.8. O 335 120 O 334 O 236
Let X ¯ ^ be the mean of a random sample of size 50 drawn from...
Let X ¯ ^ be the mean of a random sample of size 50 drawn from a population with mean 112 and standard deviation 40. Determine the expected value of the sample mean, E { X ¯ ^ } ., the standard deviation of the sample mean, the probability that the sample mean assumes a value greater than 113, and the probability that the sample mean assumes a value between 110 and 114
You would like to estimate the mean price of milk (per gallon) in your city. You...
You would like to estimate the mean price of milk (per gallon) in your city. You select a random sample of prices from different stores. The sample has a mean of 3.75 dollars and a standard deviation of 0.21 dollars. For each of the following sampling scenarios, determine which test statistic is appropriate to use when making inference statements about the population mean. (In the table, Z refers to a variable having a standard normal distribution, and t refers to...
Select the correct answer below: A sample mean of 20 miles per gallon and a sample...
Select the correct answer below: A sample mean of 20 miles per gallon and a sample standard deviation of 2 miles per gallon are obtained usin a simple random sample of 16 vehicles from a large group of vehicles, which have approximately normally distributed fuel consumption rates. A simple random sample of 23 dogs is taken from the dogs within a county with approximately normally distributed weights. The sample mean is 33 pounds, the sample standard deviation is 4 pounds,...
A normal population has a mean of 57 and a standard deviation of 14. You select...
A normal population has a mean of 57 and a standard deviation of 14. You select a random sample of 16. Round to 4 decimal places. a. 33% of the time, the sample average will be less than what specific value? Value b. 33% of the time, the value of a randomly selected observation will be less than h. Find h. h c. The probability that the sample average is more than k is 22%. Find k.
A population has a mean of 50 and a standard deviation of 7. You select a...
A population has a mean of 50 and a standard deviation of 7. You select a random sample of 36. Compute the following: The probability that the sample mean will be larger than 51.5. (3 point) The probability that the sample mean will be smaller than 48. (3 point) The value for which there is a .025 probability that the sample mean will be greater than. (3 points)
All are multiple choice quesions 1. Probability is A. Subjective judgement of the observer, how likely...
All are multiple choice quesions 1. Probability is A. Subjective judgement of the observer, how likely is something.; B. A measure rendered (adjusted to events) satisfying certain rules; C. Empirical, observed result of the (favorable) over (all) cases; D. Any number between 0 and 1; 2. Which statement is true regarding sample standard deviation? Sample standard deviation is the expected value of the smallest and the largest observations Standard deviation of the sum of two random variables...
The two curves below represent the sampling distribution of the sample mean X for two different...
The two curves below represent the sampling distribution of the sample mean X for two different sample sizes: n = 256 and n = 576. In both cases the samples are selected from the same population. Note that the standard deviation for sampling distribution A is SD(X) = 8 and for sampling distribution B the standard deviation is SD(X) = 12. What is the standard deviation SD(X) of the population from which the samples are taken? A-8^2 B-(12+8)/2 C-13.86 D-12^2...
Part B) assume the sample mean x and sample standard deviation s remained the same as...
Part B) assume the sample mean x and sample standard deviation
s remained the same as you just calculated but based on a sample of
n = 25 observations.
The random sample shown below was selected from a normal distribution. 5, 5, 5, 10, 6,5 o Complete parts a and b. a. Construct a 95% confidence interval for the population mean μ Round to two decimal places as needed.)
A normal population has a mean of 60 and a standard deviation of 12. You select...
A normal population has a mean of 60 and a standard deviation of 12. You select a random sample of 9. What is the standard error of the mean? 6
How many students (minimum possible) should be sampled if you want to estimate the true mean number of credit hours per student with an error of no more than 0.3 and 95% confidence. From a prior study, it is known that the standard deviation is 2.8. O 335 120 O 334 O 236
You would like to estimate the mean price of milk (per gallon) in your city. You select a random sample of prices from different stores. The sample has a mean of 3.75 dollars and a standard deviation of 0.21 dollars. For each of the following sampling scenarios, determine which test statistic is appropriate to use when making inference statements about the population mean. (In the table, Z refers to a variable having a standard normal distribution, and t refers to...
Select the correct answer below: A sample mean of 20 miles per gallon and a sample standard deviation of 2 miles per gallon are obtained usin a simple random sample of 16 vehicles from a large group of vehicles, which have approximately normally distributed fuel consumption rates. A simple random sample of 23 dogs is taken from the dogs within a county with approximately normally distributed weights. The sample mean is 33 pounds, the sample standard deviation is 4 pounds,...
Part B) assume the sample mean x and sample standard deviation
s remained the same as you just calculated but based on a sample of
n = 25 observations.
The random sample shown below was selected from a normal distribution. 5, 5, 5, 10, 6,5 o Complete parts a and b. a. Construct a 95% confidence interval for the population mean μ Round to two decimal places as needed.)
A normal population has a mean of 60 and a standard deviation of 12. You select a random sample of 9. What is the standard error of the mean? 6
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