Refer to attatchment.
Which of the following is equivalent to the expression 5x + 15
2 answers:
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Answer:
The mean of the sampling distribution of means for SRS of size 50 is and the standard deviation is
By the Central Limit Theorem, since we have of sample of 50, which is larger than 30, it does not matter that the underlying population distribution is not normal.
0% probability a sample of 50 people will wait longer than 45 seconds for an elevator.
Step-by-step explanation:
To solve this problem, we need to understand the normal probability distribution and the central limit theorem.
Normal probability distribution:
Problems of normally distributed samples are solved using the z-score formula.
In a set with mean and standard deviation
, the zscore of a measure X is given by:
The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.
Central limit theorem:
The Central Limit Theorem estabilishes that, for a random variable X, with mean and standard deviation
, a large sample size, of at least 30, can be approximated to a normal distribution with mean
and standard deviation
In this problem, we have that:
What are the mean and standard deviation of the sampling distribution of means for SRS of size 50?
By the Central Limit Theorem
The mean of the sampling distribution of means for SRS of size 50 is and the standard deviation is
Does it matter that the underlying population distribution is not normal?
By the Central Limit Theorem, since we have of sample of 50, which is larger than 30, it does not matter that the underlying population distribution is not normal.
What is the probability a sample of 50 people will wait longer than 45 seconds for an elevator?
We have to use 45 seconds as minutes, since the mean and the standard deviation are in minutes.
Each minute has 60 seconds.
So 45 seconds is 45/60 = 0.75 min.
This probability is 1 subtracted by the pvalue of Z when X = 0.75. So
By the Central Limit Theorem
has a pvalue of 1
1-1 = 0
0% probability a sample of 50 people will wait longer than 45 seconds for an elevator.
The table is proportional and the constant of proportionality is 1.5
Step-by-step explanation:
Proportional relationships are relationships between two variables
where their ratios are equivalent
- One variable is always a constant value times the other
- The relation between the two variables represented graphically by a line passes through the origin point
The table:
→ x : 0 : 2 : 4 : 6
→ y : 0 : 3 : 6 : 9
To prove that y ∝ x find the ratio between each value of y with corresponding value of x
∵
∵
∵
∴
∴ k = 1.5
∵ The origin point is in the table
∴ y ∝ x
∴ The table is proportional
The table is proportional and the constant of proportionality is 1.5
Learn more:
You can learn more about proportional in brainly.com/question/10708697
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