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just olya [345]
4 years ago
14

In a test of hypothesis, the null hypothesis is that the population mean is equal to 74 and the alternative hypothesis is that t

he population mean is less than 74. A sample of 20 elements selected from this normal population produced a mean of 68.5 and a standard deviation of 6.4. The significance level is 1%. What is the value of the test statistic, t?a) 6.372
b) -4.076
c) -2.509
d) -3.843
Mathematics
1 answer:
Marrrta [24]4 years ago
6 0

Answer:

Step-by-step explanation:

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The sum of three consecutive odd integers is 17 less than four time the smallest integers
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3 years ago
Two sides of a right triangle measure 7 units and 3 units.
weeeeeb [17]

Answer:

20 units squared

Step-by-step explanation:

Use pythagorean theorem to find third side of triangle

{2}^{2}  + 4 {}^{2}  =  {x}^{2}

4 + 16 =  {20}

Take the sqr root of 20

\sqrt{20}

So the side of the square is sqr root of 20

Area is length x width

The area of a square is 2 times s, where s is the length of one side since a square sides are all equal.

So

\sqrt{20}  \times  \sqrt{20 }  = 20

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3 years ago
12.89503 rounded to the hundreths is​
Mariulka [41]

\text{The hundredths place is the 2nd place after the decimal}\\\\\text{The number in the hundredths place in this case is 9}\\\\\text{You would round up if the number to the right of it it's 5 or greater}\\\\\text{You would keep it the same if the number to the right of it is 4 or less}\\\\\text{The number to the right of 9 is 5, so round up}\\\\\text{When you round, it would turn into: 12.90, since the 9 turns into a "10",}\\\text{then you carry the one over to the next number}\\\\

\boxed{\text{Answer: 12.90}}

7 0
3 years ago
Solve and explain please
vekshin1

Answer:

<h2><em><u>x</u></em><em><u> </u></em><em><u>=</u></em><em><u> </u></em><em><u>14</u></em></h2>

Step-by-step explanation:

7x + 9 = 9x - 19. <em>[</em><em>Corresponding</em><em> </em><em>Angles</em><em>]</em>

=> 9x - 19 = 7x + 9

=> 9x - 7x = 19 + 9

=> 2x = 28

=  > x =  \frac{28}{2}

=> <em><u>x</u></em><em><u> </u></em><em><u>=</u></em><em><u> </u></em><em><u>14</u></em><em><u> </u></em><em><u>(</u></em><em><u>Ans</u></em><em><u>)</u></em>

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