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Do private practice doctors and hospital doctors have the same distribution of working hours? Suppose that a sample of 100 private practice doctors and 150 hospital doctors are selected at random and asked about the number of hours a week they work. The results are shown in Table

df=_______.

Short Answer

Expert verified

df=3

Step by step solution

01

Given information

The given data is

02

Explanation

From the given table

The degree of freedom is calculated using the formula df=number of columns-1.

The number of columns is 4in this case.

df=numberofcolumn-1

localid="1654169143324" =4-1=3

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Most popular questions from this chapter

What is the p-value?

The number of births per woman in China is 1.6down from 5.91in 1966. This fertility rate has been attributed to the law passed in 1979restricting births to one per woman. Suppose that a group of students studied whether or not the standard deviation of births per woman was greater than 0.75. They asked 50women across China the number of births they had had. The results are shown in Table. Does the studentsโ€™ survey indicate that the standard deviation is greater than 0.75?

# of birthsFrequency0513021035

The standard deviation of heights for students in a school is 0.81. A random sample of 50students is taken, and the standard deviation of heights of the sample is 0.96. A researcher in charge of the study believes the standard deviation of heights for the school is greater than 0.81.

To find the value ofdf.

What is the p-value?

Table 11.42contains information from a survey among 499participants classified according to their age groups. The second column shows the percentage of obese people per age class among the study participants. The last column comes from a different study at the national level that shows the corresponding percentages of obese people in the same age classes in the USA. Perform a hypothesis test at the 5% significance level to determine whether the survey participants are a representative sample of the USA obese population.

Age Class (Years) Obese Expected (percentage) Obese Observed (Frequencies)
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31-40
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168

Table11.42

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