Recent questions in Statistics and Probability

Study design
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foass77W
2020-10-28

(I) Case-control studies are controlled experiments, whilst cohort studies are observational studies.

(II) Case-control studies are better for rare diseases, compared to cohort studies.

Probability
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glamrockqueen7
2020-10-28

Study design
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Kyran Hudson
2020-10-27

To identify:The important conditions for the validity of the procedure in the given case.

In an experiment on the effect of calcium and blood pressure, 54 healthy white males are divided into two groups’ calcium and placebo. The summary statistic for the systolic blood pressure of the 27 members of the placebo group is ¥ = 114.9 and s=9.3.

Data distributions
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Albarellak
2020-10-27

Probability
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jernplate8
2020-10-27

Normal distributions
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Ava-May Nelson
2020-10-27

Normal distributions
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emancipezN
2020-10-27

Scatterplots
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Wotzdorfg
2020-10-27

Which two of the four scatter plots have most positive correlation and closer to zero correlation

Scatterplots
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Maiclubk
2020-10-27

a. In multiple linear regression, we can determine whether we are extrapolating in predicting the value of the response variable for a given set of predictor variable values by determining whether each predictor variable value falls in the range of observed values of that predictor.

b. Irregularly shaped regions of the values of predictor variables are easy to detect with two-dimensional scatterplots of pairs of predictor variables, and thus it is easy to determine whether we are extrapolating when predicting the response variable.

Study design
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ruigE
2020-10-27

The researcher is interested compare the student's loan debt for the students who attend four-year public universities and four-year private universities. A random sample of 100 graduates of the public universities and 100 graduates of private universities are taken.

Two-way tables
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tricotasu
2020-10-26

a) What proportion of all cases had Outcome A?

b) What proportion of all cases are in Group 1?

c) What proportion of cases in group 1 had Outcome B?

d) What proportion of cases who had Outcome A were in group 2?

Scatterplots
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Tobias Ali
2020-10-26

Sketch a scatterplot where the association is nonlinear, but the correlation is close to

Scatterplots
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Trent Carpenter
2020-10-26

Two-way tables
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preprekomW
2020-10-26

Binomial probability
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abondantQ
2020-10-26

Normal distributions
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Cabiolab
2020-10-25

I. The means of the Student’s t and standard normal distributions are equal.

II. The standard normal distribution approaches the Student’s t distribution as the degrees of freedom becomes large.

A. I only

B. II only

C. Both I and II

D. Neither I nor II

Two-way tables
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CoormaBak9
2020-10-25

Two-way tables
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sodni3
2020-10-25

ordered based on the gender of the customers.

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