Aclinical trial tests a method designed to increase the probability of conceiving a girl. in the study 580 babies were born, and 319 of them were girls. use the sample data to construct a 99% confidence interval estimate of the percentage of girls born. based on the result, does the method appear to be effective?

< p <

does the method appear to be effective?

0.4967<p<0.6033

Not effective

Step-by-step explanation:

given that a  clinical trial tests a method designed to increase the probability of conceiving a girl.

In the study 580 babies were born, and 319 of them were girls

Sample proportion p=

Standard error of proportion p =

Margin of error for 99%= Z critical * std error=

(Since sample size is large Z value is used)

Confidence interval 99%

=

0.4967<p<0.6033

This method appears to be not effective as the confidence interval 99% contains 0.50 indicating probability for girls is still 0.50

think the answer would beb

fabric (square meters)                   cloaks

7                                                           21

4/3                                                         4

step-by-step explanation:

we are told that harry needs 2 square meters of fabric for every 6 wizard cloaks he makes.

1. first of all we will find how many cloaks can be made from 1 square meter of fabric by dividing 6 by 2.

we can see that 3 cloaks can be made from 1 square meter of fabric. now we will multiply 3 by 7 to find number of cloaks made from 7 square meters of fabric.

therefore, harry will make 21 cloaks from 7 square meters of fabric.

2. let us find how many square meters of fabric will be needed to make 4 cloaks.

first of all we will find fabric needed for 1 cloak by dividing 2 by 6.

we can see that fabric needed for 1 cloak is   square meter. now we will multiply   by 4 to find fabric needed for 4 cloaks.