Answer: (0.3224,0.3976)
Step-by-step explanation:
Given : Sample size : n=625
Number of people check their work email when they are at home =225
The probability of people check their work email when they are at home :
Significance level :
Critical value :
The confidence interval for population proportion is given by :-
It is 2 and it is 7 the two factors your welcome
The function f(x)= 1/x^2 is even. Hope that helps!
Kathleen must get 300 signatures to make sure she will have enough valid signatures for the crosswalk
<em><u>Solution:</u></em>
Given that Kathleen needs 240 valid signatures on a petition to get a crosswalk installed on her street
She knows that about 20% of the signatures will not be valid for a variety of reasons
Let "x" be the number of signatures
invalid signature = 20 % of x
valid signatures = 240
Then, according to question,
total number of signatures - invalid signatures = 240
x - 20 % of x = 240
Therefore, she must get 300 signatures so that she will have enough valid signatures for the crosswalk