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Anna11 [10]
3 years ago
10

Using traditional methods it takes 99 hours to receive an advanced driving license. A new training technique using Computer Aide

d Instruction (CAI) has been proposed. A researcher used the technique on 190 students and observed that they had a mean of 98 hours. Assume the population variance is known to be 49. Is there evidence at the 0.05 level that the technique reduces the training time?
State the null and alternative hypotheses.
Find the value of the test statistic. Round your answer to two decimal places
Mathematics
1 answer:
nexus9112 [7]3 years ago
8 0

Answer:

the aswer is 0.40 hope this helps

Step-by-step explanation:

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1-z/z-7 - 8z-3/7-z subtract
maxonik [38]
The answer to your question above would be: 7z-2/z-7

3 0
3 years ago
Mr. Nordman gets a commission of $2.30 on each pair of women's shoes he sells, and a commission of $3 on each pair of men's shoe
Alina [70]

Answer:

x ≥ 5

y ≥ 10

3x + 2.3y ≥ 60

Step-by-step explanation:

Lets the number of men's shoes he sells be x and women's shoes be y.

For each men's shoes , he gets a commission of $3 and for each women's shoe, he gets a commission of $2.30 .

He needs to sell atleast 10 women's shoes and 5 men's shoes.

Also he needs to make atleast $60 per week.

x ≥ 5

y ≥ 10

3x + 2.3y ≥ 60

These are are the 3 required inequalities.

Now we will see an example.

If he sells 20 womens shoes and 10 mens shoes , he will meet the requirements.

He will make a total profit = 2.3\times 20 + 3\times 10 =$76

8 0
3 years ago
Three friends were playing a game of marbles. At the end of the game, Marcy had 25% of the marbles, Roger had21of the marbles, a
Sati [7]

Answer:

54

Step-by-step explanation:

total no. of marbles=100

no. of marbles Marcy had

=25% of 100

=25/100×100

=25

no. of marbles Roger had=21

Let the no. of marbles Ann had=x.

So, 25+21+x=100

46+x=100

x=100-46=54

Therefore, Ann had 54 marbles at the end of the game.

8 0
3 years ago
If 6:2=8:x, then<br><br> a. 6x = 16<br> b. 6x = 10<br> c. 2x = 48<br> d. 2x = 14
stellarik [79]

Answer:

6x = 16

Step-by-step explanation:

Given:

\displaystyle \large{6:2 = 8:x}

The equation can be rewritten as:

\displaystyle \large{\dfrac{6}{2}=\dfrac{8}{x}}

Multiply both sides by 2x.

\displaystyle \large{\dfrac{6}{2}\cdot 2x=\dfrac{8}{x}\cdot 2x}

Simplify the equation in simplest form.

\displaystyle \large{6x=8\cdot 2}\\\\\displaystyle \large{6x=16}

Therefore, the answer to this question is 6x = 16.

Please let me know if you have any questions regarding my answer or explanation!

7 0
2 years ago
If the value of a changes in response to the value of b then b is the _____?
Alex17521 [72]
B is the independent variable, while y is the dependent variable.
7 0
3 years ago
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