Answer:
Six
Step-by-step explanation:
Six is thirty percent of twenty.
The answer is false i think but i am not sure
Answer:
There is no significant evidence to conclude that the mean waiting time is less than 3.8 minutes
Step-by-step explanation:
H0 : μ = 3.8
H1 : μ < 3.8
Test statistic :
(x - μ) ÷ s/sqrt(n)
(3.7 - 3.8) ÷ 0.6/sqrt(60)
Test statistic = - 1.29
The Pvalue from test statistic :
P(z < -1.29) = 0.0985
Reject Null if
Pvalue < α
0.0986 > 0.01 ; Hence, we fail to reject the null ;
There is no significant evidence to conclude that the mean waiting time is less than 3.8 minutes
A group of a 1,000 randomly chosen individuals took a test that measures verbal reasonings and also a test that measures problem-solving abilities a correlation coefficient .06 was found between the two scores on the test for this group. What is the correlation coefficient?
Answer:
<em><u></u></em>
Explanation:
<u>1. Determine the percent of people who developed dementia from the entire population. </u>
a)<u> From the percent of people who had depression</u>:
b) <u>From the number of people who did not have depression</u>:
c) <u>Total percent:</u>
- 2.2% + 15.3% 17.5% of all people developed dementia.
<u>2. Probability that the person suffered from depression earlier in life, if a person has developed dementia:</u>
- percent of people who developed dementia and had depression / percent of people who developed dementia = 2.2% / 17.5% = 0.126
Note, that this can be calculated using the formula for conditional probability:
Where:
- A is having suffered depression
- B is having developed dementia
- A∩B is having both suffered depression and developed dementia
- P(A∩B) = 22% ₓ 10% = 2.2% = 0.022
- P(B) = 22% × 10% + 17% × 90% = 17.5% = 0.175
- P(A/B) = P(A∩B) / P(B) = 0.022 / 0.175 = 0.126
