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I am Lyosha [343]
3 years ago
8

Assume that when adults with smartphones are randomly​ selected, 49​% use them in meetings or classes. If 9 adult smartphone use

rs are randomly​ selected, find the probability that at least 4 of them use their smartphones in meetings or classes.
Mathematics
1 answer:
kati45 [8]3 years ago
3 0
Sorry I don’t know this I would help but I don’t know
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Consider the following hypothesis test H0 p 20 Ha p 20 A sample of 400 provided a sample proportion p 175 a Compute the value of
Bogdan [553]

Answer:

a) -1.25

b) 0.2112

c) -1.96

Step-by-step explanation:

Data provided in the question:

Sample size, n = 400

H0 : p = 20

\bar{p} = 175

Now,

a) The test statistic is  given as:

Z = \frac{(\bar{p}-p)}{\sqrt{\frac{p(1-p)}{n}}}

on substituting the respective values, we get

Z = \frac{(0.175-0.2)}{\sqrt{\frac{0.2\times0.8}{400}}}

= -1.25

b) The p-value = 2 × P(Z <-1.25)

Now from the standard normal table

P(Z <-1.25) = 10.56% = 0.1056

Thus,

p-value = 2 × 1056 = 0.2112

c) for a = 0.05,

the critical value is Z_{\frac{a}{2}}=Z_{\frac{0.05}{2}} i.e Z_{0.025}

Now from standard normal table

Z_{0.025} = -1.96

3 0
3 years ago
Use mapping notation to describe a translation up 8 units.
7nadin3 [17]
B, y goes up 8, when you add 8 to y
3 0
3 years ago
PLSSSSSS!!!! HELP ME I WILL MARK YOU!!!!!!! MATH!!!!!!!!!!!!!!
scoundrel [369]

Answer:

-24

Step-by-step explanation:

-1(3^2)+(-15)

  -9+(-15)

      -24

8 0
3 years ago
Read 2 more answers
I need these all written out on how they're done along with the answer please
taurus [48]
Well, these are quite simple really, especially 1,2,3 and 4. If you read the questions carefully, you can understand it well. You don’t need to know the answer, you just need to understand
8 0
3 years ago
What is the relationship between 9.125×10−3 and 9.125×102?
gavmur [86]

Answer:

100,000 then its less

good luck

8 0
3 years ago
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