Seasonal effect on human births

Reference no: EM131008186

If there is no seasonal effect on human births, we would expect equal numbers of children to be born in each season (winter, spring, summer and fall). A student takes a census of her statistics class and finds that of the 120 students in the class, 25 were born in winter, 35 in spring, 32 in sum- mer and 28 in fall. She wonders if the excess in the spring is an indication that births are not uniform throughout the year.

a) What is the expected number of births in each season if there is no "seasonal effect" on births?

b) Compute the x2 statistic.

c) How many degrees of freedom does the x2 statistic have?

Reference no: EM131008186

Questions Cloud

Conclude about the null hypothesis : If there is no seasonal effect, about how big, on average, would you expect the x2 statistic to be (what is the mean of the x2 distribution)? Does the statistic you computed in Exercise 1 seem large in comparison to this mean? Explain briefly

Describe different residential construction systems : The assignment is on the topic Plastics. Kindly be very careful about plagiarism and referencing - Describe different residential construction systems and Sketch typical construction details free hand or preferably via an elementary CAD package.

Problem regarding the degrees of freedom : What is the expected number of customers applying for each type of card in this sample if the historical proportions are still true? Compute the x2 statistic. How many degrees of freedom does the x2 statistic have?

Explain in simple language what signi?cantly higher : A friend thinks that "signi?cantly" in this article has its plain English meaning, roughly "I think this is important." Explain in simple language what "signi?cantly higher" and "not signi?cantly different from zero" actually tell us here.

Seasonal effect on human births : If there is no seasonal effect on human births, we would expect equal numbers of children to be born in each season (winter, spring, summer and fall).

Determining the degrees of freedom : Lobster industry 2008, price diagnosed. In Chapter 18, Exercise 35 (Lobster industry 2008), we constructed the fol- lowing regression model to predict the Price of lobster har- vested in Maine's lobster fishing industry.

Advantages of different ways of reporting approval percent : One of the questions asked whether the respondents had a favorable or an unfavorable opinion of 17 news personalities. Diane Sawyer received the highest rating, with 80% of the respondents giving her a favorable rating.39, What is the population f..

Interpretation of the coefficient : What is the interpretation of the coefficient of the constructed variable December? What additional assumption is required to include the variable December in this model? Is there reason to believe that it is satisfied?

Determining the pizza ratings : a) Why is there no coefficient for Medium? b) Explain how the coefficients of Small, Large, and Very Large account for the size of the city in this model.

User Account

All Pages