See the attachment for the answer and enjoy :)
add this statement at the end...... "<span>Also, if she retires at 67, then there are 67-25=42 years of investment, which gives A=$53212.28"</span>

4 0

3 years ago

Can someone simplify these for me? I am in desperate need of help. Thank You! [PICS]

Nitella [24]

2\x^-5y this is for the first one
and for the second i do'nt know sorry

4 0

3 years ago

A true/false test has 8080 questions. Suppose a passing grade is 5252 or more correct answers. Test the claim that a student kn

Makovka662 [10]

<h2>Answer with explanation:</h2>

Let p be the proportion of the correct answers.

As per given , we have

$H_0: p=0.50$

$H_a: p>0.50$ , since the alternative hypothesis is right tailed , so the test is a one -tailed test.

If the student gets 52 answers correct out of 80.

i.e. the proportion of correct answers : $\dfrac{52}{80}=0.65$

Test statistic : $z=\dfrac{\hat{p}-p}{\sqrt{\dfrac{p(1-p)}{n}}}$

$z=\dfrac{0.65-0.50}{\sqrt{\dfrac{0.50(0.50)}{80}}}\approx2.68$

P-value : $P(z>2.68)=0.0037$ [ by using p-value table for z (right-tailed)]

Since the p-value(0.0037) is less than the significance level (0.05), so we reject the null hypothesis.

Results : We have enough evidence to support the claim that a student knows more than half of the answers and is not just guessing.

8 0

3 years ago