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Inga [223]
3 years ago
13

Fifteen years ago 57% of American families had money invested in the stock market. It is believed that this percentage has dropp

ed. To see if this is true, Morningstar recently sampled 200 American families and recorded in Excel each family’s Yes/No answer to the question "Do you have money invested in the stock market?". Based on these results, can Morningstar declare that the proportion of American families who have money invested in the stock market is now lower than .57 at α=.01? Use the excel output above to answer the following question.Find the critical value (typically two decimals if zcrit, three decimals if tcrit).
Mathematics
1 answer:
statuscvo [17]3 years ago
3 0

Answer:

z(critic) = -2.33

Step-by-step explanation:

In this case this is a population proportion test because the observations are simple random sampled and there is a fixed number of trials with only two possible options. Also, n is big enough.

Since this is a population test, the test statistic is z.

Also, this is a one tailed tast because the claim is that the population proportion is less than 0.57.

In this case, for a 0.01 significance level, z(critic) = -2.33

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Hello Guys, I really need help with these questions. Here they are.
Slav-nsk [51]

Answer:

See below.

Step-by-step explanation:

It can really help to think when you see |expression| that it means the distance from expression to zero.

(a)  |x| < 7  means the distance from  x  to 0 is less than 7.  That puts  x  between -7 and 7.  The solution set is  -7 < x < 7.

(b)  |x + 3| < 9 means that the distance from x + 3 to 0 is less than 9.  That puts x + 3 between -9 and 9:

-9 < x + 3 < 9   Now subtract 3 from all three parts.

-12 < x < 6

(c)  |y - 8| > 11 means that the distance from y - 8 to 0 is more than 11 units.  That puts  y - 8 in one of two places:  left of -11 or right of 11.

y-8 < -11 \text{ or } y-8 > 11\\\\y < -3 \text{ or } y > 19

(g)  |3x-1| \ge 18 means that the distance from 3x - 1 to 0 is more than (or equal to)  18.  Another way to say it is, 3x - 1 is farther from 0 than 18 units.  That puts  3x - 1 in one of two places:  to the left of -18 or to the right of 18.

3x-1  \le -18 \text{ or } 3x-1 \ge 18\\\\3x \le -17 \text{ or } 3x \ge 19\\\\x \le -\frac{17}{3} \text{ or } x \ge \frac{19}{3}

|4y+3| \le 13  means that 4y + 3 is closer to 0 than 13;  it is between -13 and 13.

-13 \le 4y+3 \le 13\\\\-16 \le 4y \le 10\\\\-4 \le y \le \frac{5}{2}

(That last fraction is 10/4 simplified.)

3 0
2 years ago
Read 2 more answers
The function f(x) is graphed. It represents a translation of the square root function g(x) = . What equation represents the grap
weqwewe [10]

Using translation concepts, the equation of the graph of f(x) is given as follows:

f(x) = \sqrt{x - 1}

<h3>What is a translation?</h3>

A translation is represented by a change in the function graph, according to operations such as multiplication or sum/subtraction in it's definition.

Function f(x) is a shift right of one unit of the square root function, hence x -> x - 1 and the equation is given by:

f(x) = \sqrt{x - 1}

More can be learned about translation concepts at brainly.com/question/4521517

#SPJ1

8 0
2 years ago
The standard deviation for a set of data is 8.5. The mean is 215.
mixas84 [53]
The answer to your question is 2.5 hope this helps
6 0
3 years ago
Girlcome 5324611502 <br>p:1234​
alina1380 [7]

Answer:

Subscribe to my animations Y0UTUBE channel! Channel name: Let Me Explain Studios. Have a nice day!

Step-by-step explanation:

4 0
2 years ago
Pretty pls help me with A and B with work SHOWN
-BARSIC- [3]
A.  11/30 x 50= 18/36=1/2

18/36 x 1/10= 5/100

B.    1,210 x 1.1= 1,331

I am not so sure about A, but I hope this helps a little.
7 0
3 years ago
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