1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Scilla [17]
3 years ago
14

1. A researcher believes that university students weigh more than the population. The researcher reasons that more time spent on

studying for exams means having less time to exercise. The researcher selects an alpha level of 0.10 (or CL = 90%). Upon looking at census data, the average American weighs 170lbs with a standard deviation of 35lbs.
The researcher takes a random sample of 225 CSU students and finds that the mean weight of CSU students is 180lbs with a sample standard deviation of 45.

Is there enough evidence to reject the null hypothesis?
Mathematics
1 answer:
andrew11 [14]3 years ago
8 0

Answer:

The null and alternative hypotheses are:

H_{0}: \mu = 170

H_{a}: \mu >170

Under the null hypothesis, the test statistic is:

z=\frac{\bar{x}-\mu}{\frac{\sigma}{\sqrt{n}} }

         =\frac{180-170}{\frac{35}{\sqrt{225}} }

         =\frac{10}{2.33}

         =4.29

Now, we have to find the right tailed z critical value at 0.10 significance level. Using the standard normal table, we have:

z_{critical} = 1.28

Since the test statistic is greater than the z critical value, we therefore, reject the null hypothesis and conclude that there is sufficient evidence to support the claim that the university students weigh more than the population.


You might be interested in
What is the answer for this question plz help
emmainna [20.7K]
So you swap sides and you have 3x=93 and then you divide 3 by 93 and you get x=31
6 0
2 years ago
What would be the solution to 45x - 180 ≤720 be?
tia_tia [17]

Answer:

X<20

Step-by-step explanation:

hope this helps

3 0
2 years ago
Read 2 more answers
Please solve for me. C=1/2x(a+w)
Gnoma [55]

Answer:

C= 1/(2ax+2aw)

Step-by-step explanation:

C=1/2x(a+w)

Multiply a and w by 2x. Take note of the sign.

C= 1/(2ax+2aw)

when writing your answer, you don't need the brakets. I just put them so you'd understand that all those characters in the bracket are the denominator.

Please rate 5 stars, thanks, give brainliest. Thanks.

5 0
3 years ago
Read 2 more answers
Help asap please bbbbb
Alex

Answer:432 whats the other option 4300

Step-by-step explanation:

4 0
1 year ago
The 4 in 400,000 has a value of 400 yes or no
Oduvanchick [21]

I'm pretty sure its not.

8 0
3 years ago
Read 2 more answers
Other questions:
  • Hello there ^ _ ^ <br><br> Can you help me please ? Please explain how you find the answer. Thanks!
    11·1 answer
  • Can someone answer this please!!!
    12·1 answer
  • 157/14 written as a Mixed number
    15·2 answers
  • Which statement about this system of equations are true check all that apply<br> PLS H
    12·2 answers
  • What would the football player's weight be on the moon where acceleration due to gravity is
    13·1 answer
  • (x-2)3 <br><br><br><br><br><br><br><br> nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn
    13·1 answer
  • .........................................
    10·1 answer
  • What is 53 divided by 76
    8·2 answers
  • Geometry helppppp plssss
    9·1 answer
  • Sydney took a trip to a relative’s house for Thanksgiving. She drove 65 miles per hour for 1. 5 hours and 55 miles per hour for
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!