The area of juans garden

A study of 420 comma 000 cell phone users found that 134 of them developed cancer of the brain or nervous system. Prior to this

Vesnalui [34]

Answer: (0.00306,0.00334)

Step-by-step explanation:

Given : Sample size : n= 420000

The number of users developed cancer of the brain or nervous system =134

Then , the proportion of users developed cancer of the brain or nervous system :

$p=\dfrac{134}{420000}\approx0.0032$

Significance level : $1-0.90=0.1$

Critical value : $z_{\alpha/2}=1.645$

The confidence interval for population proportion is given by :-

$p\ \pm\ z_{\alpha/2}\sqrt{\dfrac{p(1-p)}{n}}\\\\=0.0032\pm (1.645)\sqrt{\dfrac{(0.0032)(1-0.0032)}{420000}}\approx0.0032\pm0.00014\\\\=(0.00306,0.00334)$

Hence, the 90% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system is (0.00306,0.00334).

4 0

3 years ago

Which function has a greater rate of change?

omeli [17]

Answer:

Function A has a rate of change of 5 and Function B has a rate of change of 4.5. Thus, Function A has a higher rate of change

Step-by-step explanation:

3 0

3 years ago

Which expression is<br> equivalent to 25x + 12 ?

My name is Ann [436]

Answer:

Step-by-step explanation:

What are the choices?

6 0

3 years ago

How many solutions does this system of

Anettt [7]

D) infinitely Many solutions

6 0

3 years ago

Read 2 more answers

Please answer correctly !!!!! Will mark Brianliest !!!!!!!!!!!!!!

jolli1 [7]

Answer:

the 3rd option (36, 48, 60)

Step-by-step explanation:

i used a²+b² = c²

8 0

3 years ago