Question Details

Answered) (For Questions 1 & 2) Mimi was the 5th seed in 2014 UMUC Tennis Open that took place in August. In this tournament, she won 80 of her 100...


I need help with the following problems and I need to show my work. I am really struggling with my statistics class and just want to get this done. Thank you so much

(For Questions 1 & 2) Mimi was the 5th seed in 2014 UMUC Tennis Open that took place in
August. In this tournament, she won 80 of her 100 serving games. Based on UMUC Sports
Network, she wins 75% of the serving games in her 5-year tennis career.
1. (4 pts) Find a 90% confidence interval estimate of the proportion of serving games Mimi
won. (Show work and round the answer to three decimal places) 2. (10 pts) In order to determine if this tournament result is better than her career record of 75%.
We would like to perform the following hypothesis test:
H 0 : p=0. 75
H a : p> 0.75 (a) (4 pts) Find the test statistic. (Show work and round the answer to two decimal places) (b) (4 pts) Determine the P-value for this test. (Show work and round the answer to three
decimal places) 1 (c) (2 pt) Is there sufficient evidence to justify the rejection of H0 at the α =0.02 level? Explain. 3. (10 points) The SAT scores are normally distributed. A simple random sample of 225 SAT
scores has a sample mean of 1500 and a sample standard deviation of 300.
(a) (2 pt) What distribution will you use to determine the critical value? Why? (b) (6 pts) Construct a 95% confidence interval estimate of the mean SAT score. (Show work and
round the answer to two decimal places) (c) (2 pt) Is a 99% confidence interval estimate of the mean SAT score wider than the 95%
confidence interval estimate you got from part (b)? Why? [You don’t have to construct the 99%
confidence interval] 4. (14 points) Consider the hypothesis test given by
H 0 : μ=650
H a : μ> 650 Assume the population is normally distributed. In a random sample of 25 subjects, the sample
mean is found to be ´x =655 , and the sample standard deviation is s=28.
2 (a) (2 pt) Is this test for population proportion, mean or standard deviation? What distribution
should you apply for the critical value? (b) (2 pt) Is the test a right-tailed, left-tailed or two-tailed test? (c) (4 pts) Find the test statistic. (Show work and round the answer to two decimal places) (d) (4 pts) Determine the P-value for this test. (Show work and round the answer to three
decimal places) (e) (2 pt) Is there sufficient evidence to justify the rejection of
Explain. 3 H0 at the α =0.02 level? 5. (12 pts) Assume the population is normally distributed with population standard deviation of
80. Given a sample size of 25, with sample mean 740, we perform the following
hypothesis test.
H 0 : μ=750
H a : μ< 750 (a) (2 pt) Is this test for population proportion, mean or standard deviation? What
distribution should you apply for the critical value? (b) (4 pts) What is the test statistic? (Show work and round the answer to three decimal
places) (c) (4 pts) What is the p-value? (Show work and round the answer to two decimal places) (d) (2 pts) What is your conclusion of the test at the α = 0.10 level? Why? (Show work) 6. (14 pts) A new prep class was designed to improve SAT math test scores. Five students were
selected at random. Their scores on two practice exams were recorded; one before the class and
one after. The data recorded in the table below. We want to test if the scores, on average, are
higher after the class.
SAT Math Score Student 1 Student 2 Student 3 Student 4 Student 5 Score before the class 620 700 650 640 620 Score after the class 640 700 670 670 630 (a) (2 pt) Which of the following is the appropriate test and best distribution to use for the test?
(i) Two independent means, normal distribution
4 (ii) Two independent means, Student’s t-distribution
(iii) Matched or paired samples, normal distribution
(iv) Matched or paired samples, Student’s t-distribution
(b) (2 pt) Let μd be the population mean for the differences of scores (scores after the class –
before the class). Fill in the correct symbol (=, ≠, ≥, >, ≤, <) for the null and alternative
hypotheses.
(i) H0: μd ________ 0
(ii) Ha: μd ________ 0
(c) (4 pts) What is the test statistic? (Show work and round the answer to three decimal places) (d) (4 pts) What is the p-value? (Show work and round the answer to three decimal places) (e) (2 pt) What is your conclusion of the test at the α = 0.05 level? Why? (Show work) 7. (4 pts) True or False: The rejection region for a test at 5% level of significance is larger than
the rejection region for a test at 1% level of significance. (Justify for full credit) 8. (4 pts) True or False: In a right-tailed test, the test statistic is 1.5. If we know P(X < 1.5) =
0.96, then we reject the null hypothesis at 0.05 level of significance. (Justify for full credit) 9. (4 pts) If we reject the null hypothsis in a statistical test at the 0.05 level, then we can
conclude: 5 a. We fail to reject the null hypothesis at 0.01 level
b. We fail to reject the null hypothesis at 0.10 level
c. We do not know the conclusion at 0.01 level
d. We can definitely reject the null hypothesis above 0.01 level
10. (4 pts) Three hundred students took a chemistry test. You sampled 50 students to estimate the
average score and the standard deviation. How many degrees of freedom were there in the
estimation of the standard deviation?
a. 50
b. 49
c. 300
d. 299 6

 


Solution details:
STATUS
Answered
QUALITY
Approved
ANSWER RATING

This question was answered on: Sep 05, 2019

PRICE: $18

Solution~000200093334.zip (25.37 KB)

Buy this answer for only: $18

This attachment is locked

We have a ready expert answer for this paper which you can use for in-depth understanding, research editing or paraphrasing. You can buy it or order for a fresh, original and plagiarism-free solution (Deadline assured. Flexible pricing. TurnItIn Report provided)

Pay using PayPal (No PayPal account Required) or your credit card . All your purchases are securely protected by .
SiteLock

About this Question

STATUS

Answered

QUALITY

Approved

DATE ANSWERED

Sep 05, 2019

EXPERT

Tutor

ANSWER RATING

GET INSTANT HELP/h4>

We have top-notch tutors who can do your essay/homework for you at a reasonable cost and then you can simply use that essay as a template to build your own arguments.

You can also use these solutions:

  • As a reference for in-depth understanding of the subject.
  • As a source of ideas / reasoning for your own research (if properly referenced)
  • For editing and paraphrasing (check your institution's definition of plagiarism and recommended paraphrase).
This we believe is a better way of understanding a problem and makes use of the efficiency of time of the student.

NEW ASSIGNMENT HELP?

Order New Solution. Quick Turnaround

Click on the button below in order to Order for a New, Original and High-Quality Essay Solutions. New orders are original solutions and precise to your writing instruction requirements. Place a New Order using the button below.

WE GUARANTEE, THAT YOUR PAPER WILL BE WRITTEN FROM SCRATCH AND WITHIN YOUR SET DEADLINE.

Order Now