A real estate company is analyzing the selling prices of residential homes in a given community.140 homes that have been sold in the past month are randomly selected and their selling prices are recorded.The statistician working on the project has stated that in order to perform various statistical tests,the data must be distributed according to a normal distribution.In order to determine whether the selling prices of homes included in the random sample are normally distributed,the statistician divides the data into 6 classes of equal size and records the number of observations in each class.She then performs a chi-square goodness-of-fit test for normal distribution.The results are summarized in the following table. 
What is the appropriate null hypothesis?
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Nonsocial Play
Play in which children engage alone, without interaction with other children or adults.
Associative Play
A stage of play where children interact and engage in a common activity but do not coordinate their actions or goals.
Cooperative Play
A stage in child development where children play together, sharing ideas and materials, and working towards a common goal or activity.
Cooperative Play
A stage of play development where children play together, working towards a common goal or participating in shared activities.
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