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2 years ago

8 5

1 answer:

7 0

Answer:

Yes, they form a proportion

How:

If you divide 24 by 3 you get 8 and if you divide 15 by 3 you get 8 so these ratios are a proportion

You might be interested in

Sophie is adding a new room to her house she knows the total area will be 70 square feet and she knows the length will be 10 fee

11111nata11111 [884]

70/10=7
If total is 70
L=10
W=X
70\10=7

6 0

2 years ago

Determine the slope of the line passing through each pair of points. (5, 8) and (-4, 6)

JulsSmile [24]

Answer:

picture?

Step-by-step explanation:

4 0

3 years ago

2x+5=12 i don´t know what the value of x is

Ilya [14]

Answer: X = 7/2 or 3.5

3 0

2 years ago

Number 15 explain......

ddd [48]

The slope intercept form is y=mx+b where b is the y-intercept and m is the slope
y=-3x+b
substituting in the point (-4,-6)
-6=12+b
b=-18
so our equation is y=-3x-18
we can also solve by using the slope point formula
y-y1=m(x-x1)
y+6=-3(x+4)
y+6=-3x-12
y=-3x-18 which is the same as our first answer

6 0

2 years ago

In January 1995, each student in a random sample of 150 physics majors at a large university was asked in how many lab classes h

Mnenie [13.5K]

Answer:

The data provide evidence that the mean number of lab classes taken by physics majors in January 1995 is not different from the mean number of lab classes taken in 2015.

Step-by-step explanation:

A t-test for difference between means can be used to determine whether the mean number of lab classes taken by physics majors in January 1995 is different from the mean number of lab classes taken in 2015.

The hypothesis is:

H₀: There is no difference between the two population means, i.e. μ₁ = μ₂.

Hₐ: There is a significant difference between the two population means, i.e. μ₁ ≠ μ₂.

The survey was conducted in a similar pattern. Assume that the two population standard deviations are same.

The information provided is:

$\bar x_{1}=1.74\\s_{1}=1.49\\\bar x_{2}=1.87\\s_{1}=1.57\\n_{1}=n_{2}=150\\\alpha =0.10$

The test statistic is:

$t=\frac{\bar x_{1}-\bar x_{2}}{s_{p}\sqrt{\frac{1}{n_{1}}+\frac{1}{n_{2}}}}$

Here s $_{p}$ is the pooled standard deviation.

Compute the value of pooled standard deviation as follows:

$s_{p}=\sqrt{\frac{(n_{1}-1)s_{1}^{2}+(n_{2}-1)s_{2}^{2}}{n_{1}+n_{2}-2}}=\sqrt{\frac{(150-1)1.49^{2}+(150-1)1.57^{2}}{150+150-2}}=1.531$

Compute the test statistic value as follows:

$t=\frac{\bar x_{1}-\bar x_{2}}{s_{p}\sqrt{\frac{1}{n_{1}}+\frac{1}{n_{2}}}}=\frac{1.74-1.87}{1.531\times\sqrt{\frac{1}{150}+\frac{1}{150}}}=-0.735$

The test statistic value is -0.735.

The decision rule is:

If the p - value of the test is less than the significance level, α = 0.10 then the null hypothesis will be rejected and vice-versa.

Compute the p-value as follows:

$p-value=2P(t_{298}$

The p-value = 0.463 > α = 0.10.

As the p-value is more than the significance level the null hypothesis will not be rejected at 10% level of significance.

Conclusion:

The data provide evidence that the mean number of lab classes taken by physics majors in January 1995 is not different from the mean number of lab classes taken in 2015.

8 0

2 years ago