1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
mylen [45]
2 years ago
9

After extensive measurements of the time necessary to complete the first homework assignment, a teacher determines that there is

a population mean of 100 and a stardard deviation of 20. If she samples a class of 60 students and calculates a mean of 96 minutes, what is the z statistic (round to the nearest 2 decimal places, don't forget a negative sign if necessary)?
Mathematics
1 answer:
MaRussiya [10]2 years ago
4 0

Answer: -1.55

Step-by-step explanation:

Given : Mean : \mu=100

Standard deviation : \sigma=20

Sample size : n=60

Sample mean : \overline{x}=96

The test statistic for the population mean is given by :-

z=\dfrac{\overline{x}-\mu}{\dfrac{\sigma}{\sqrt{n}}}

\Rightarrow\ z=\dfrac{96-100}{\dfrac{20}{\sqrt{60}}}=-1.54919333848\approx-1.55

Hence, the value of z statistic = -1.55

You might be interested in
Gwen says that the sum of -1 3/4 and 2 1/2 is the same as the difference between 2 1/2 and 1 3/4. Is Gwen correct? Explain why o
solong [7]

Answer: No

Step-by-step explanation: no because one is negative 1 3/4 and the other one isint in the negatives

4 0
2 years ago
What is 5 8/9 + 7 /13
Ede4ka [16]
I pretty sure that the answer would be 6 50/117 but if you get a fraction calculator app it can help more.
3 0
3 years ago
Read 2 more answers
If 4 raffle tickets is 6 dollars how much is 1 raffle ticket
sertanlavr [38]
4/6 = 1/x cross multiple so x= 1.5 dollars
8 0
3 years ago
10.2 = 20 is rewritten as 2.10 = 20. Was this
Phantasy [73]

Answer: comutative law

Step-by-step explanation:

Factor order does not change product.

4 0
3 years ago
​Joe's annual income has been increasing each year by the same dollar amount. The first year his income was ​$17 comma 90017,900
Vedmedyk [2.9K]

Answer:

In 17th year, his income was $30,700.

Step-by-step explanation:

It is given that the income has been increasing each year by the same dollar amount. It means it is linear function.

Income in first year = $17,900

Income in 4th year = $20,300

Let y be the income at x year.

It means the line passes through the point (1,17900) and (4,20300).

If a line passes through two points (x_1,y_1) and (x_2,y_2), then the equation of line is

y-y_1=\frac{y_2-y_1}{x_2-x_1}(x-x_1)

The equation of line is

y-17900=\frac{20300-17900}{4-1}(x-1)

y-17900=\frac{2400}{3}(x-1)

y-17900=800(x-1)

y-17900=800x-800

Add 17900 on both sides.

y=800x-800+17900

y=800x+17100

The income equation is y=800x+17100.

Substitute y=30,700 in the above equation.

30700=800x+17100

Subtract 17100 from both sides.

30700-17100=800x

13600=800x

Divide both sides by 800.

\frac{13600}{800}=x

17=x

Therefore, in 17th year his income was $30,700.

5 0
3 years ago
Other questions:
  • What is the equation of a line that has a slope of 4/3 and goes through the point (0, – 3), in slope-intercept form?
    7·1 answer
  • Shane deposits $500 in an account that earns 7.4% interest compounded annually. What is the balance in the account after 3 years
    15·1 answer
  • A number is multiplied by 3. if 2 is added to the product you get 17. what is the number
    7·1 answer
  • The sum of two consecutive integers is at most 223.<br><br> What is the larger of the two integers?
    13·2 answers
  • What are the coordinates of the midpoint of the segment whose endpoints are E(2, 9) and F(8, –3)?
    8·1 answer
  • A phone company offers two monthly plans. Plan A costs 14 plus an additional 0.09 for each minute of calls. Plan B costs 18 plus
    12·1 answer
  • A(3,5) (x,y)-&gt;(x+2, y-4) What are the coordinates of A?​
    14·1 answer
  • An airplane is flying from New York City to Los Angeles. The distance it travels in miles, d, is related to the time in seconds,
    13·1 answer
  • How do you expand (8+x) (9+x)
    7·1 answer
  • 14. Higher Order Thinking Mr. Kent
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!