Question

I've got 2 questions that I'd appreciate some help with. I will grant a medal to those who help.

Answer 1

In a sample of 100 households, the mean number of hours spent on social networking sites during the month of January was 50 hours. In a much larger study, the standard deviation was determined to be 6 hours. Assume the population standard deviation is the same. What is the 98% confidence interval for the mean hours devoted to social networking in January?

Answer 2

and

Two studies were completed in Florida. One study in northern Florida involved 2,000 patients; 64% of them experienced flu-like symptoms during the month of December. The other study, in southern Florida, involved 3,000 patients; 54% of them experienced flu-like symptoms during the same month. Which study has the smallest margin of error for a 95% confidence interval?

Answer 3

@nincompoop @dan815 @jim_thompson5910 @ganeshie8

Answer 4

@campbell_st

Answer 5

In a sample of 100 households, the mean number of hours spent on social networking sites during the month of January was 50 hours. In a much larger study, the standard deviation was determined to be 6 hours. Assume the population standard deviation is the same. What is the 98% confidence interval for the mean hours devoted to social networking in January?


from that we can find

n = 100
xbar = 50
sigma = 6

Answer 6

if the confidence level is 98%, then what is the critical value?

Answer 7

I'm not exactly sure honestly. If I were to be looking for critical value, how would I find it?

Answer 8

do you have a calculator?

Answer 9

yes

Answer 10

a TI calculator?

Answer 11

yes

Answer 12

hit 2nd, then the vars key

Answer 13

scroll down to invNorm