In a sample of n=3,600 students, the average GPA was x=3.5 with a sample variance of...
In a sample of n=3,600 students, the average GPA was x=3.5 with a sample variance of s2=0.25. Calculate the 98% confidence interval for the population GPA μ
The upper limit of the confidence interval is (round to two digits)
Question 5 options:
|
3.47 |
|
|
3.48 |
|
|
3.52 |
|
|
3.53 |
Homework Answers
Add Answer to:
In a sample of n=3,600 students, the average GPA was x=3.5 with
a sample variance of...
you extract a sample of 115 students from this university. The sample proportion is the proportion...
you extract a sample of 115 students from this university. The sample proportion is the proportion of students in this sample who live on campus. The standard deviation of the sampling distribution of this sample proportion, rounded to four decimal places, is: 5. A random sample of 82 customers, who visited a department store, spent an average of $71 at this store. Suppose the standard deviation ofexpenditures at this store is σ. $19. The 98% confidence interval for the population...
Arandom sample of 100 students had a mean grade point average (GPA) of 3.2 with a...
Arandom sample of 100 students had a mean grade point average (GPA) of 3.2 with a standard error of 0.02. Given below are the 90%, 95%, 98% and 99% confidence intervals (not necessarily in that order) for the mean GPA for all students. Which interval would represent the 95% confidence interval? (3.15, 3.25) (3.17.3.23) (3.16, 3.24) (3.14, 3.26)
2. Assume that the observed value of the sample mean X and of the sample variance S2 of a random sample of size n from...
2. Assume that the observed value of the sample mean X and of the sample variance S2 of a random sample of size n from a normal population is 81.2 and 26.5, respectively Find %90,%95, %99 confidence intervals for the population mean μ
2. Assume that the observed value of the sample mean X and of the sample variance S2 of a random sample of size n from a normal population is 81.2 and 26.5, respectively Find %90,%95, %99 confidence...
The grade point averages (GPA) of 18 randomly selected college students are used to estimate the...
The grade point averages (GPA) of 18 randomly selected college students are used to estimate the mean GPA of the college students. The GPAs from the sample are as follows: 2.3 3.3 2.6 1.8 0.2 3.1 4.0 0.7 3.1 2.3 2.0 3.1 3.4 1.3 2.6 2.6 3.7 2.2 (5 points) Is it justified to use of the standard normal distribution to construct the confidence interval? Explain. (10 points) If the population is assumed to be normally distributed, construct a 98% confidence interval for the population mean GPA. Show your work in detail and use 3...
A study was carried out to estimate the average GPA (μ) of undergraduates at a universtiy....
A study was carried out to estimate the average GPA (μ) of undergraduates at a universtiy. Assume that the standard deviation sigma (σ) of their GPA is 0.30. From a random sample of students, researcher finds (3.30, 3.60) to be a 87% confidence interval for the average GPA. What was the researcher's sample size? Round up answer to an integer.
1. A random sample of 20 students yielded a mean ofT 72 and a variance of s2 16 for scores on a c...
1. A random sample of 20 students yielded a mean ofT 72 and a variance of s2 16 for scores on a college placement test in mathematics. Assuming the scores to be normally distributed, construct a 98% confidence interval for σ2. Be sure to » State if the problem involves 1 population or 2 populations. If you have 2 populations, should they be paired or not? . State a State whether you should use z, t, or x2 and find...
Summary data on daily caffeine consumption for a sample of adult women is the following: n...
Summary data on daily caffeine consumption for a sample of adult women is the following: n = 36, sample mean= 215 mg. Assume the population is normally distributed with standard deviation is σ = 12 mg. Construct an appropriate 98% confidence interval for the population mean, μ. A.) What is your point estimate? B.) Critical Value? C.) Standard Error? D.) Margin of Error? E.) Lower Confidence Bound (or limit)? F.) Upper Confidence Bound (or limit)?
QUESTION 9 It is known that the variance of a population equals 1444. A random sample...
QUESTION 9 It is known that the variance of a population equals 1444. A random sample of 100 observations is going to be taken from the population. Compute the margin of error corresponding to a 96% level of confidence. NOTE: WRITE YOUR ANSWER WITH 4 DECIMAL DIGITS. DO NOT ROUND UP OR DOWN. QUESTION 12 The average score of a sample of 100 senior business majors at UTC who took the Graduate Management Admission Test was 530 with a variance...
11] The Excel output on GPA below was generated from a sample of 30 students in...
11] The Excel output on GPA below was generated from a sample of 30 students in Stats II using the descriptive statistics function in Excel. These are all sample statistics. What is the upper bound to the 95% confidence interval around the mean? n 30 Mean Standard Error Median Mode Standard Deviation Sample Variance Kurtosis Skewness Range Minimum 2.943666667 0.09068004 2.84 2.5 0.496675037 0.246686092 1.011303207 0.36205901 1.74 2.17 3.91 88.31 30 0.185461504 a. 2.978 b. 3.129 C. 3.341 d. 2.873...
A simple random sample of size n is drawn from a population that is normally distributed....
A simple random sample of size n is drawn from a population that is normally distributed. The sample mean, x overbar x, is found to be 107, and the sample standard deviation, s, is found to be 10. (a) Construct a 98% confidence interval about mu μ if the sample size, n, is 18. (b) Construct a 98% confidence interval about mu μnif the sample size, n, is 12. c) Construct a 96% confidence interval about mu μ if...
you extract a sample of 115 students from this university. The sample proportion is the proportion of students in this sample who live on campus. The standard deviation of the sampling distribution of this sample proportion, rounded to four decimal places, is: 5. A random sample of 82 customers, who visited a department store, spent an average of $71 at this store. Suppose the standard deviation ofexpenditures at this store is σ. $19. The 98% confidence interval for the population...
Arandom sample of 100 students had a mean grade point average (GPA) of 3.2 with a standard error of 0.02. Given below are the 90%, 95%, 98% and 99% confidence intervals (not necessarily in that order) for the mean GPA for all students. Which interval would represent the 95% confidence interval? (3.15, 3.25) (3.17.3.23) (3.16, 3.24) (3.14, 3.26)
2. Assume that the observed value of the sample mean X and of the sample variance S2 of a random sample of size n from a normal population is 81.2 and 26.5, respectively Find %90,%95, %99 confidence intervals for the population mean μ
2. Assume that the observed value of the sample mean X and of the sample variance S2 of a random sample of size n from a normal population is 81.2 and 26.5, respectively Find %90,%95, %99 confidence...
1. A random sample of 20 students yielded a mean ofT 72 and a variance of s2 16 for scores on a college placement test in mathematics. Assuming the scores to be normally distributed, construct a 98% confidence interval for σ2. Be sure to » State if the problem involves 1 population or 2 populations. If you have 2 populations, should they be paired or not? . State a State whether you should use z, t, or x2 and find...
QUESTION 9 It is known that the variance of a population equals 1444. A random sample of 100 observations is going to be taken from the population. Compute the margin of error corresponding to a 96% level of confidence. NOTE: WRITE YOUR ANSWER WITH 4 DECIMAL DIGITS. DO NOT ROUND UP OR DOWN. QUESTION 12 The average score of a sample of 100 senior business majors at UTC who took the Graduate Management Admission Test was 530 with a variance...
11] The Excel output on GPA below was generated from a sample of 30 students in Stats II using the descriptive statistics function in Excel. These are all sample statistics. What is the upper bound to the 95% confidence interval around the mean? n 30 Mean Standard Error Median Mode Standard Deviation Sample Variance Kurtosis Skewness Range Minimum 2.943666667 0.09068004 2.84 2.5 0.496675037 0.246686092 1.011303207 0.36205901 1.74 2.17 3.91 88.31 30 0.185461504 a. 2.978 b. 3.129 C. 3.341 d. 2.873...
Most questions answered within 3 hours.
-
Bob is moving away from Alice with speed of 0.5c. Carlos is
moving away from Alice...
asked 16 minutes ago -
Interpret the following regression model:
Repairs = 0.33 + 0.312 New Cars + 0.71 Used...
asked 14 minutes ago -
Explain the principle of DC converter operation with (a)
resistive and (b) RL load using appropriate...
asked 15 minutes ago -
All of the following statements are true regarding the LIFO
reserve except:
Select one:
a. Companies...
asked 21 minutes ago -
Discuss the predicament that a safety professional faces knowing
that some OSHA regulations are outdated and...
asked 21 minutes ago -
Suppose the times (in hours) that it took for a tax preparer to
complete 15 randomly...
asked 21 minutes ago -
A 30-kg box is at rest on a horizontal floor with friction
coefficients μs = 0.65...
asked 23 minutes ago -
Erwin Schrödinger’s proposal regarding the
characteristics of electrons behavior, (What he meant
by wave like behavior...
asked 32 minutes ago -
Four years ago, your firm issued $1,000 par, 25-year bonds, with a
7 percent coupon rate...
asked 33 minutes ago -
A charity website collects donations for cancer
research. They are considering a sponsored post on Facebook...
asked 31 minutes ago -
Suppose you had an unknown solution which was either NaCl or
3NaNO, and you needed to...
asked 37 minutes ago -
why are the small particles in soil so important relative to the
large particles ?
what...
asked 41 minutes ago