Zarina wants to determine a confidence interval based on a random poll she conducted about the percent of attendees at a conference who are vegetarian. she determined the margin of error for her poll results using the equation below. e = 1.96 /.3(1-.3)/540 based on zarina’s work, what can be concluded? with 90% confidence, between 4% and 30% of the attendees are vegetarian. with 90% confidence, between 26% and 34% of the attendees are vegetarian. with 95% confidence, between 4% and 30% of the attendees are vegetarian. with 95% confidence, between 26% and 34% of the attendees are vegetarian.

With 95% confidence, between 26% and 34% of the attendees are vegetarian.

Step-by-step explanation:

Given:

Zarina used 1.96 for confidence interval for the proportion

We know that a sample proportion will have standard error as

square root of pq/n

So from the information given,E = 1.96 /.3(1-.3)/540

we find that since 1.96 is used, 95% confidence level was done.

Sample size n =540

p = 0.3 and q = 0.7

Std error =

Margin of error = 1.96(std error) = 0.038

=0.040 (after rounding off)

=4%

Based on Zarina’s work, it can be concluded that: 

suitable option would be which as 4 as margin of error and 95% Conf level.

With 95% confidence, between 26% and 34% of the attendees are vegetarian.

is right answer.

what do u need to know

step-by-step explanation:

the solution of the equation is 2.23 ⇒ answer b

step-by-step explanation:

* lets revise the meaning of exponential function

- the form of the exponential function is y = ab^x, where a ≠ 0, b > 0 ,  

  b ≠ 1, and x is any real number

- it has a constant base b

- it has a variable exponent x

- to solve an exponential equation, take the log or ln of both sides,  

  and solve for the variable

* lets solve the problem

∵

- the base is 7 and the exponent is x

- insert ㏑ in both sides

∴

- use the rule

∴ x ㏑(7) = ㏑(77)

- to find x divide both sides by ㏑(7)

∴

* the solution of the equation is 2.23 to the nearest 2 decimal places