Respuesta :
Answer:
44.23% probability that the mean weight loss after one week on this pill for a random sample of 55 individuals will be 1.77 pounds or more
Step-by-step explanation:
To solve this question, 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 [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the zscore of a measure X is given by:
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
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 normally distributed random variable X, with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean [tex]\mu[/tex] and standard deviation [tex]s = \frac{\sigma}{\sqrt{n}}[/tex];
For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.
In this problem, we have that:
[tex]\mu = 1.75, \sigma = 1.02, n = 55, s = \frac{1.02}{\sqrt{55}} = 0.1375[/tex]
What is the probability that the mean weight loss after one week on this pill for a random sample of 55 individuals will be 1.77 pounds or more
This is 1 subtracted by the pvalue of Z when X = 1.77. So
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
By the Central Limit Theorem
[tex]Z = \frac{X - \mu}{s}[/tex]
[tex]Z = \frac{1.77 - 1.75}{0.1375}[/tex]
[tex]Z = 0.145[/tex]
[tex]Z = 0.145[/tex] has a pvalue of 0.5577
1 - 0.5577 = 0.4423
44.23% probability that the mean weight loss after one week on this pill for a random sample of 55 individuals will be 1.77 pounds or more
