Hypothesis testing - Radial tires

Three different brands of all season radial tires were tested for wear characteristics. For each brand, 4 tires were selected and subjected to a standard wear test. The distance (thousands of kilometers) achieved by these tires is provided in the table below. (please see attachment) At the 5% level of significance, is there a difference in the mean distances achieved by each of the brands?

Hypothesis testing - water consumption

An analyst would like to predict water consumption in a city based on daily temperature. She has gathered the following data for a random sample of n= 7 days. (Please see attachment for data). Using the following sums and sums of squares and cross-products A) Compute the regression line to explain "water consumption" in terms of "temperature". B) Test, at the α= 0.01 level of significance, whether temperature is a significant predictor of water consumption. C) Compute the coefficient of determination of the regression model. D) Find a 99% confidence interval for water consumption on a particular day when the temperature is 28ºC.

Hypothesis Testing

One hundred people selected at random from various levels of management were interviewed regarding their concern about environmental issues. The response of each person was tallied into one of three categories: no concern, some concern, and great concern. The results were as follows: (see attached file for data) At the 0.01 level of significance, is there a relationship between level of management and level of concern? Formulate and test the appropriate hypothesis.

error varience is high (2nd attempt)

Suppose the error varience in your study is high. Which of these statements is most likely to be true? a. Your power is high. b. The relationship between your independent variable and dependent variance is strong. c. Confounds interfered with measuring your dependent variable or manipulating your independent variable. d. Participates between each of your conditions have very different scores.

Record the type of researchsmoking

Record the type of research design used. True lab experiment, quasi-experiment, field experiment, or correlation design. Dr. Reynolds studies the relationship between parental smoking and children's health. He found that the more frequently the parents smoked in the househod, the more likely children in the household had lung damage. I think the answer is field experiment????????