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2021-11-23
Answered

A researcher was interested in knowing whether the mean weight of the second baby is higher, lower, or about the same as the mean weight of the first baby for women who have at least two children

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Abel Maynard

Answered 2021-11-24
Author has **19** answers

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asked 2021-02-08

When designing a study to determine this population proportion, what is the minimum number of drivers you would need to survey to be 90% confident that the population proportion is estimated to within 0.05? (Round your answer up to the nearest whole number.)

asked 2021-03-08

The pathogen Phytophthora capsici causes bell pepper plants to wilt and die. A research project was designated to study the effort of soil water content and the spread of the disease in fields of bell peppers. It is thought that too much water helps spread the disease. The fields were divided into rows and quadrants. The soil water content (percent of water by volume of soil) was determined for each plot. An important first step in such a research is to give a statistical description of the data.

asked 2021-03-02

Determine whether the study depicts an observational study or an experimental study.

A study was done to see if sugar consumption can cause hypoeractivity in children. The researcher took four groups of children and assigned different amounts of sugar the children had to consume. After a certain period of time, they assessed whether or not the children were hyperactive.

A study was done to see if sugar consumption can cause hypoeractivity in children. The researcher took four groups of children and assigned different amounts of sugar the children had to consume. After a certain period of time, they assessed whether or not the children were hyperactive.

asked 2020-12-03

The article “Rocker Shoe Put to the Test: Can it Really Walk the Walk as a Way to Get in Shape?” (USA TODAY, October 12, 2009) describes claims made by Skechers about Shape-Ups, a shoe line introduced in 2009. These curved-sole sneakers are supposed to help you “get into shape without going to the gym” according to a Skechers advertisement. Briefly describe how you might design a study to investigate this claim. Include how you would select subjects and what variables you would measure. Is the study you designed an observational study or an
experiment?

asked 2021-03-08

Prove that the reduced row echelon forms of the matrices

are the two matrices.

The point of the reduced row echelon form is that the corresponding system of linear equations is in a particularly simple form, from which the solutions to the system

asked 2020-11-08

The pathogen Phytophthora capsici causes bell pepper plants to wilt and die. A research project was designed to study the effect of soil water content and the spread of the disease in fields of bell peppers. It is thought that too much water helps spread the disease. The fields were divided into rows and quadrants. The soil water content (percent of water by volume of soil) was determined for each plot. An important first step in such a research project is to give a statistical description of the data. Soil Water Content for Bell Pepper Study
$$\begin{array}{cccccccccccccc}15& 14& 14& 14& 13& 12& 11& 11& 11& 11& 10& 11& 13& 16\\ 9& 15& 12& 9& 10& 7& 14& 13& 14& 8& 9& 8& 11& 13\\ 15& 12& 9& 10& 9& 9& 16& 16& 12& 10& 11& 11& 12& 15\\ 10& 10& 10& 11& 9\end{array}$$
If you have a statistical calculator or computer, use it to find the actual sample mean and sample standard deviation.

asked 2020-12-24

When designing a study to determine this population proportion, what is the minimum number of drivers you would need to survey to be 95% confident that the population proportion is estimated to within 0.05? (Round your answer up to the nearest whole number.)