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2 years ago

13

Ada has y blue note book and w red notebook .she combined them and was able to see half of the items. how many items did Ada sel

l?

1 answer:

maria [59]2 years ago

5 0

Answer:

She sold 1 item and remains with 1 item

Step-by-step explanation:

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Consider the following hypothesis test: H 0: 20 H a: < 20 A sample of 60 provided a sample mean of 19.5. The population stand

viva [34]

Answer:

We reject the null hypothesis and accept the alternate hypothesis. Thus, it be concluded that the population mean is less than 20.

Step-by-step explanation:

We are given the following in the question:

Population mean, μ = 60

Sample mean, $\bar{x}$ = 19.5

Sample size, n = 60

Alpha, α = 0.05

Population standard deviation, σ = 1.8

First, we design the null and the alternate hypothesis

$H_{0}: \mu = 20\\H_A: \mu < 20$

We use One-tailed z test to perform this hypothesis.

Formula:

$z_{stat} = \displaystyle\frac{\bar{x} - \mu}{\frac{\sigma}{\sqrt{n}} }$

Putting all the values, we have

$z_{stat} = \displaystyle\frac{19.5 - 20}{\frac{1.8}{\sqrt{60}} } = -2.151$

Now, $z_{critical} \text{ at 0.05 level of significance } = -1.64$

Since,

$z_{stat} < z_{critical}$

We reject the null hypothesis and accept the alternate hypothesis. Thus, it be concluded that the population mean is less than 20.

5 0

3 years ago

HELP ME ASAP!!!!!!!!!!

MAXImum [283]

Answer: x(2) -9

I’m pretty sure that it

4 0

2 years ago

Read 2 more answers

dezoksy [38]

For the first one it’s h=6 and the second one is h=-3

4 0

2 years ago

(-x2y3)*(12xy3)<br>(-2xy2)3

Leokris [45]

Assuming the numbers are exponents expect the coefficient of 2, top expression, -12x^3y^6, multiply bottom
and= 72x^4y^8

4 0

2 years ago

As the music plays,the volume changes In the beginning of the piece can be modeled by the equation s=10Ix-4I+50 where s represen

Ipatiy [6.2K]

Answer:

-127

Step-by-step explanation:

s = 101x-41+50

80 = 101x - 4+ 50

-101x

-181 = x - 4 +50

-181 = x -54

+ 54

-127 = x

I hope this helps

8 0

2 years ago