A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 370 babies were born, and 333 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?

CI=[0.8592,0.9402]

Yes, Method appears to be effective.

Step-by-step explanation:

-We first calculate the proportion of girls born:

Since np, we assume normal distribution and calculate the 99% confidence interval as below:

Hence, the confidence interval is {0.8598, 0.9402]

-The probability of giving birth to a girl is 0.5 which is less than the lower boundary of the confidence interval, it can be concluded that the method appears to be effective.

step-by-step explanation:

12475909

rick has $1400 and sally has $1500

step-by-step explanation:

to find amount of money rick has after 10 years :

principal = $1000 , time = 10 years , rate = 4% annually

to find amount of money sally has after 10 years :

her friend gives to pay her $50 per year, therefore money she has after 10 years = 50 × 10 = $500

also, sally gets $1000 after 10 years,

therefore, total amount of money sally has after 10 years = 500 + 1000 = $1500

so, after 10 years : rick has $1400 and sally has $1500