Chi-Square Analysis of Cells in Mitosis Cards

Chi-Square (χ2) Test Use the Chi-Square Test to compare the cells shown on the onion cell cards vs. the textbook-given information (cell cycle model) Null hypothesis: There is NO significant difference between the textbook values & observed data from onion cells Any differences are due to CHANCE alone

Observed Data Count onion cells on your card. # Interphase: # Mitosis: Class Data: Interphase: Mitosis: Total # Cells:

Expected Data The textbook model of the cell cycle says that 90% of the cell cycle is spent in Interphase. Calculate expected # cells: Total # Cells: Interphase: Mitosis:

Calculations Category Expected (Textbook values) Observed (Cells on cards) (o-e)2/e Interphase Mitosis TOTAL: X2 =

Chi-Square Analysis n = ______ Χ2 = _______ df = n-1 = _______ At p=0.05, the critical value is ________. Conclusion: The Χ2 value is _________ than the critical value, therefore the null hypothesis is _____________. Any difference between observed an expected data is _______________________.