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nikdorinn [45]
3 years ago
8

Which of the following is a statistical question? A. How many students know how much they weigh? B. What is Kaycee's weight? C.

How many students are in Kaycee's reading class? D. What are the weights of the students in Kaycee's reading class?
Mathematics
1 answer:
s2008m [1.1K]3 years ago
3 0
Answer: D

A is just a survey (yes or no answers), B is more of a factual question (not concerning a set or population), and C is the same as B
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A ladder 15 feet from the base of a building reaches a window that is 35 feet high. What is the length of the ladder to the near
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7 0
2 years ago
According to a marketing research study, American teenagers watched 14.8 hours of social media posts per month last year, on ave
ki77a [65]

Answer:

The value of test statistics is 1.06.

Step-by-step explanation:

We are given that according to a marketing research study, American teenagers watched 14.8 hours of social media posts per month last year, on average. A random sample of 11 American teenagers was surveyed and the mean amount of time per month each teenager watched social media posts was 15.6. This data has a sample standard deviation of 2.5.

We have to test if the mean amount of time American teenagers watch social media posts per month is greater than the mean amount of time last year or not.

Let, NULL HYPOTHESIS, H_0 : \mu = 14.8 hours  {means that the mean amount of time American teenagers watch social media posts per month is same as the mean amount of time last year}

ALTERNATE HYPOTHESIS, H_1 : \mu > 14.8 hours  {means that the mean amount of time American teenagers watch social media posts per month is greater than the mean amount of time last year}

The test statistics that will be used here is One-sample t-test;

             T.S. = \frac{\bar X - \mu}{\frac{s}{\sqrt{n} } } ~ t_n_-_1

where, \bar X = sample mean amount of time per month each teenager watched social media posts = 15.6 hours

             s = sample standard deviation = 2.5 hours

             n = sample of teenagers = 11

So, <u>test statistics</u> =  \frac{15.6 - 14.8}{\frac{2.5}{\sqrt{11} } } ~ t_1_0

                            = 1.06

Hence, the value of test statistics is 1.06.

5 0
3 years ago
What's 3 4/5 + 4 1/5
kumpel [21]

Answer:

if we will take the LCM

five will be common

34+41/5

75/5

15 is the answer

8 0
2 years ago
Read 2 more answers
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