Hypotheses testing

A normal tomato will gain an average of 2 ounces per week during the growing season. A sample of 100 tomatoes is given a special hormone to increase their growth. The average weight gain of tomatoes in the sample was 3 ounces with a standard deviation of 1 ounce. Conduct a hypothesis test to determine if the hormone increased the tomatoes weight gain (Hint: ). Assume Alpha = .01 and remember to clearly state your null and alternate hypothesis as well as your conclusion about the average weight gain of the tomatoes.

The real estate data is now in an excel spreadsheet

UPDATE - Part B is the most important - if you are only able to help with that part, please do so. Refer to the Real Estate data, which reports information on homes sold in Denver, Colorado,last year. a. Let selling price be the dependent variable and size of the home the independent variable. Determine the regression equation. Estimate the selling price for a home with an area of 2,200 square feet. Determine the 95 percent confidence interval and the 95 percent prediction interval for the selling price of a home with 2,200 square feet. b. Let selling price be the dependent variable and distance from the center of the city the independent variable. Determine the regression e... click for more

Hypotheses testing

2) The U.S. government recently reported that the proportion of people feeling negative about the economy was only 30%. However, a recent poll by CNN/Gallup found that in a sample of 1000 people 450 of them felt negative about the economy. Conduct a hypothesis test to determine if the proportion of people feeling negative about the economy is really 30% or not (Hint: ). Assume Alpha = .05 and remember to clearly state the null and alternate hypothesis as well as your conclusion about the proportion of people who are feeling negative about the economy.

Regression

6) The following regression line shows how the monthly return for the mutual fund TWCUX (Twentieth Century Ultra Fund) is mathematically related to the S&P500 monthly return. TWCUX = -2.61 + 1.27 (S&P500) Explain what both the intercept and slope of the regression line tell you in the context of this problem. Calculate what the estimated monthly return for TWCUX would be if the monthly return for the S&P 500 were 15%.

Correlation coefficient - colds 5

5) Suppose the following table shows the number of colds 7 different people got during the typical cold season based on the number of times they washed they washed their hands per day during the cold season. Calculate the correlation coefficient and interpret its meaning as applied to this problem. In addition, using a hypothesis test determine if the correlation coefficient is statistically different from 0 (i.e. ) # of Times Wash Hands # of Colds 0 7 1 4 2 3 3 2 4 2 5 3 6 1