# Urgent: Hypothesis Testing with unknown standard deviation

#### xjxjx

##### New Member
Hi, I'm having a lot of trouble figuring out this problem without knowing the standard deviation. Please if anyone could help me that would be very much appreciated. Thank you! I also don't know how to calculate anything other than a 95% confidence interval.

A national survey conducted in 2011 among a simple random sample of 1507 adults shows that 56% of Americans think the CIvil War is still relevant to American politics and political life.

a) Create a hypothesis test to determine if these data provide strong evidence that the majority of the American think the Civil war is still relevant.

b) Interpret the p-value in this context.

c) Calculate a 90% confidence interval for the proportion of Americans who think the Civil War is still relevant. Interpret the interval in this context, and comment on whether or not the confidence interval agrees with the conclusion of the hypothesis test.

#### Mean Joe

##### TS Contributor
Hi, I'm having a lot of trouble figuring out this problem without knowing the standard deviation.
Okay you're right that you need a standard deviation. But you do have it.

First thing, is there are two kinds of hypothesis tests that you should know about:
1) Hypothesis test for proportions
2) Hypothesis test for means

Understand this first. What kind of hypothesis test are you doing?