# Question: Spontaneous dental hydroplosion is a disease makes your teeth spontaneously turn into liquid. To investigate whether a new drug can prevent the onset of this disease, Jim Halpert decided to perform a study in which half of the fourteen employees at Dunder Mifflin Scranton received the drug and the other half received a placebo. Neither Jim nor the employees were told who received which treatment, and the number of times a subject’s teeth turned into liquid was recorded. This is an example of –Free Chegg Question Answer

Spontaneous dental hydroplosion is a disease makes your teeth spontaneously turn into liquid. To investigate whether a new drug can prevent the onset of this disease, Jim Halpert decided to perform a study in which half of the fourteen employees at Dunder Mifflin Scranton received the drug and the other half received a placebo. Neither Jim nor the employees were told who received which treatment, and the number of times a subject’s teeth turned into liquid was recorded. This is an example of

(A) A double-blind experiment.

(B) A matched-paired experiment.

(C) An experiment, but neither double-blind or matched-pair.

(D) An observational study.

In order to make thorough conclusions, the most important condition for statistical inference is usually that

(A) the population distribution follows a Normal distribution exactly.

(B) the data does not contain outliers.

(C) the data follows the asymmetric, single-peaked distribution.

(D) the data can be treated as a random sample from the population of interest.

A study was taken at the large senior living retirement community, The Senior Living Community, found that the average age of residents is 73 years with a standard deviation of 6.1 years. A simple random sample of 100 residents is selected and the sample mean age !̅(“x-bar”) of these residents is calculated. you know that the random variable X has approximately a normal distribution because of

(A) the central limit theorem.

(B) the 68-95-99.7 rule.

(C) the population that you’ve sampled from does not have a Normal distribution.

(D) the law of large numbers.

1.

Since, neither researcher nor the employees were told who received which treatment, this is an example of

(A) A double-blind experiment.

2.

In order to make thorough conclusions, the most important condition for statistical inference is usually that

(D) the data can be treated as a random sample from the population of interest.

3.

The sample mean age  of these residents has approximately a normal distribution because of

(A) the central limit theorem.

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Answer:

1.

Since, neither researcher nor the employees were told who received which treatment, this is an example of

(A) A double-blind experiment.

2.

In order to make thorough conclusions, the most important condition for statistical inference is usually that

(D) the data can be treated as a random sample from the population of interest.

3.

The sample mean age  of these residents has approximately a normal distribution because of

(A) the central limit theorem.