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3 years ago

Let x represent the year and y represent the amount of sales, in millions of dollars, in the regression equation.

Mathematics

1 answer:

stellarik [79]3 years ago

5 0

I believe the answer is D

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in a given year, the rate of flu infection for the general public was 8.3%. And sample of 200 people who receive the flu vaccine

makkiz [27]

Answer:

$\fbox{\begin{minipage}{10em}Option A is correct\end{minipage}}$

Step-by-step explanation:

Step 1: Define significance level

In this hypothesis testing problem, significance levels α is selected: $0.05$ , the associated z-value from Laplace table:

Φ( $z$ ) = α - $0.5 = 0.05 - 0.5 = -0.45$

=> $z$ = $-1.645$

Step 2: Define null hypothesis ( $H_{0}$ ) and alternative hypothesis ( $H_{1}$ )

$H_{0}$ : rate of flu infection $p$ = 8.3% or 8.3/100 = 0.083

$H_{1}$ : rate of flu infection $p$ < 8.3% or 8.3/100 = 0.083

Step 3: Apply the formula to check test statistic:

$K = \frac{f - p}{\sqrt{p(1 - p)} } * \sqrt{n}$

with $f$ is actual sampling percent, $p$ is rate of flu infection of $H_{0}$ , $n$ is number of samples.

The null hypothesis will be rejected if $K < z$

Step 4: Calculate the value of K and compare with $z$

$K = \frac{(\frac{3.5}{100}) - 0.083}{\sqrt{0.083(1 - 0.083)} } * \sqrt{200} = -2.46$

We have $-2.46 < -1.645$

=>This is good evidence to reject null hypothesis.

=> The actual rate is lower. (As $H_{1}$ states)

Hope this helps!

5 0

3 years ago

I just need help doing (d). I don’t know how to do it. Brainliest will be donated to the best answer

Tasya [4]

Answer:

Step-by-step explanation:

We need to solve this equation by graphing. We need to find what roots will make our equation equal zero. This is the same as drawing a line

$y = 0$

and see what points intercepts both graphs.

According to the graph above, one root are between 0 and 0.5 and the other are between 4 and 4.5.

We can find it actual value by solving it

$- 1 + \frac{9}{2} x - {x}^{2} = 0$

$- {x}^{2} + \frac{9}{2} x - 1 = 0$

Apply Quadratic Formula, we get

$\frac{9 + \sqrt{65} }{4}$

and

$\frac{9 - \sqrt{65} }{4}$

Which gives us approximately

x=4.27 and 0.23

4 0

3 years ago

Read 2 more answers

The median of an isosceles triangle is the same segment in the triangle as the _______.

hoa [83]

Answer: Altitude!!!

Step-by-step explanation:

APEX

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3 years ago

#9 evaluate the expression below

m_a_m_a [10]

Answer:

#9 is 3

#19 0.56

#20 0.63 :)

Step-by-step explanation:

4 0

3 years ago

Solve for p: p2 + 36 = 13p. Pls help

SashulF [63]

Answer:

p=4

p=9

Step-by-step explanation:

7 0

3 years ago