Choose the correct answer thanks!!!

Irina18 [472]

<span>The point estimate of the mean percentage of reservations is the midpoint of the interval, which is 3.2%</span>

4 0

3 years ago

A school teacher is worried that the concentration of dangerous, cancer-causing radon gas in her classroom is greater than the s

kompoz [17]

Answer: At a 5% significance level, the critical value is <u>1.690</u>.

Step-by-step explanation:

Let $\mu$ denotes the average concentration of radon gas.

Given : A school teacher is worried that the concentration of dangerous, cancer-causing radon gas in her classroom is greater than the safe level of 4pCi/L.

As per given , the appropriate hypothesis to test :

$\text{Null hypothesis }:H_0:\mu\leq4$

$\text{Alternative hypothesis }:H_a:\mu>4$

[Note : Alternative hypothesis used to express strictly greater than or less than signs and null hypothesis is opposite of it.]

∵ alternative hypothesis is right tailed , so the test must be a right tailed test (one-tailed test.)

Also the population standard deviation is unknown , so we use t-test.

[Note : we have given sample standard deviation as s=1pCi/L. ]

Sample size : 36

Then , degree of freedom = n-1=35

Now, for $\alpha=0.05$ level of significance, the right-tailed critical value would be

$t_{df, \alpha}=t_{35,0.005}=1.690$ [Using the students' t-distribution table ]

Hence, At a 5% significance level, the critical value is $t_{df, \alpha}=1.690$ .

5 0

3 years ago

Read 2 more answers

The population in the United States is approximately 3.2× 10^8. A total of 1.4 × 10^6 people immigrated to the United States. De

kodGreya [7K]

Answer:

3.186 x 10^8

Step-by-step explanation:

3.2× 10^8 = 320,000,000

1.4 × 10^6 = 1,400,000

320,000,000 - 1,400,000 = 318,600,000

318,600,000 = 3.186 x 10^8

- you get to the power of eight, by counting the amount of spaces the decimal moved over (moving to the left increase, but right decreases)

8 0

3 years ago

5 types of kitchen accidents and how to prevent them

Shalnov [3]

Answer:

Cutting any kind of fruit or vegetable. Prevent this by wearing gloves in the kitchen.
Forgotten kitchen spills are a major tripping hazard. Prevent this by not spilling anything, or if when you do, clean it up right away.
Washing dishes can result in knicks of plates and bowls, even even washing a knife improperly can harm you. Prevent this by being extra cautious when washing anything.
Unstable cutting boards are asking for improper cuts. Prevent this by only cutting on a surface that is level, sturdy, and reliable.
Skin contact with Chile Powder, or any kind of harmful cleaning substance.

Thanks so much for letting me help!!

8 0

4 years ago

Read 2 more answers

If m1 =53 what is m3

Thepotemich [5.8K]

Answer:

143

Step-by-step explanation:

90-53=37

180-37=143

5 0

3 years ago