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laila [671]
3 years ago
12

Nick and his family traveled by train to New York City. The clocks show when the train left the station and when it arrived in N

ew York City. How long was the train ride?
Mathematics
1 answer:
kirill [66]3 years ago
5 0

Answer:

Answer: 4 hr 15 min is the right answer

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nếu nhà nghiên cứu chọn đơn vị thứ k từ một tổng thể n đơn vị, điều này có ý nghĩa cô ấy đang sử dụng kỹ thuật chọn mẫu nào? Vì
stiv31 [10]

Answer:

Simple random sampling

Step-by-step explanation:

Every element of the population does have an equal probability of getting chosen in a basic random sampling. The entire population should be included in your sample frame. To conduct this sort of sampling, technologies such as random numbers or other approaches relying completely on chance can be used.

4 0
3 years ago
50 pts!!!! Luciana's laptop has 3,000 pictures. The size of the pictures is skewed to the right, with a mean of 3.7MB and a stan
skelet666 [1.2K]

Answer:

<u></u>

  • <u>Part A: No, you cannot.</u>

<u></u>

  • <u>Part B: 0.4491</u>

Explanation:

<u>Part A:</u>

The mean of samples of symmetrical (bell shaped) distributions follow a normal distribution pattern.

Thus, for symmetrical distributions you can use the z-score tables to make calculations that permit calculate probabilities for particular values.

For <em>skewed </em>distributions, in general, the samples do not follow a normal distribution pattern, except that the samples are large.

Since <em>a sample of 20 pictures</em> is not large enough, the answer to this question is negative: <em>you cannot accurately calculate the probability that the mean picture size is more than 3.8MB for an SRS (skewed right sample) of 20 pictures.</em>

<u>Part B.</u>

For large samples, the<em> Central Limit Theorem</em> will let you work with samples from skewed distributions.

Although the distribution of a population is skewed, the <em>Central Limit Theorem</em> states that  large samples follow a normal distribution shape.

It is accepted that samples of 30 data is large enough to use the <em>Central Limit Theorem.</em>

Hence, you can use the z-core tables for standard normal distributions to calculate the probabilities for a <em>random sample of 60 pictures</em> instead of 20.

The z-score is calculated with the formula:

  • z-score = (value - mean/ (standard deviation).
  • z=(x-\mu )/\sigma

Here, mean = 3.7MB, value = 3.8MB, and standard deviation = 0.78MB.

Thus:

         z=(3.7M-3.8MB)/(0.78MB)=-0.128

Then, you must use the z-score table to find the probability that the z-score is greater than - 0.128.

There are tables that show the cumulative probability in the right end and tables that show the cumulative probability in the left end of a normal standard distribution .

The probability that a z-score is greater than -0.128 is taken directly from a table with the cumulative probability in the left end. It is 0.4491.

4 0
3 years ago
Raul had 56 bouncy balls. he puts 3 times as many balls into red gifts bags as he puts into green gift bags. If he puts the same
Radda [10]
The answer is 3 ÷ 56 = 18 or Raul puts 18 balls in 3 bags.
5 0
3 years ago
Is this a function? Answer only if you know if you put links I will report
evablogger [386]

Answer:

No

Step-by-step explanation:

You can tell if something is a function by checking to see if a vertical line will intersect at one spot more than once. If it does, it is not a function.

3 0
3 years ago
What is the final cost of a book priced at $10.00 with a tax rate of 5%?
Sophie [7]

Answer:

10.50

Step-by-step explanation:

5% of 10 is 0.5

0.5+10=10.50

5 0
2 years ago
Read 2 more answers
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