This topic contains a solution. Click here to go to the answer

Author Question: The standard deviation of a binomial distribution is _____. a. E(x) = pn(1 n) b. E(x) = np(1 p) ... (Read 82 times)

jc611

  • Hero Member
  • *****
  • Posts: 552
The standard deviation of a binomial distribution is _____.
 a. E(x) = pn(1  n)
  b. E(x) = np(1  p)
  c. E(x) = np
  d. None of the answers is correct.

Question 2

The average starting salary of students who graduated from colleges of Business in 2009 was 48,400 . A sample of 100 graduates of 2010 showed an average starting salary of 50,000 . Assume the standard deviation of the population is known to be 8000 . We want to determine whether or not there has been a significant increase in the starting salaries.
 a. State the null and alternative hypotheses to be tested.
  b. Compute the test statistic.
  c. The null hypothesis is to be tested at the 5 level of significance. Determine the critical value for this test.
  d. What do you conclude?
  e. Compute the p-value.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

vseab

  • Sr. Member
  • ****
  • Posts: 323
Answer to Question 1

d

Answer to Question 2

a. H0:   48,400
Ha:  > 48,400
b. Test statistic z = 2.0
c. Critical z = 1.645
d. Reject H0 and conclude that there has been a significant increase in the starting salaries.
e. p-value = .0228




jc611

  • Member
  • Posts: 552
Reply 2 on: Jun 24, 2018
Wow, this really help


nothere

  • Member
  • Posts: 324
Reply 3 on: Yesterday
Excellent

 

Did you know?

Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.

Did you know?

Essential fatty acids have been shown to be effective against ulcers, asthma, dental cavities, and skin disorders such as acne.

Did you know?

The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

Did you know?

The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

Did you know?

According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.

For a complete list of videos, visit our video library