Question

I need the R code please

2. (10 pts) Textbook problem 10.5.2 only part a), page 389 Note that you are comparing the sex ratios, so when you input the data in R, you should make the data matrix as follows (because R compares columns with columns). Males Females 89 31 Site 1 Site II Open Ground 34 20 136 Write the null and alternative hypotheses in words. Use R to run a chi-square test to compare the sex ratios at three sites. Show the R. output and write the conclusion in words.

Answer 1

i)

alpha = 0.05

Null and Alternate Hypothesis

H₀: The two variables (Site and Sex) are independent.

H_a: The two variables are associated.

ii)

datatable <- matrix(c(89,34,74,31,20,136),nrow=3,ncol=2)

     [,1] [,2]

[1,]   89   31

[2,]   34   20

[3,]   74 136

chisq.test(datatable,correct=FALSE)

        Pearson's Chi-squared test

data:  datatable

X-squared = 49.741, df = 2, p-value = 1.581e-11

Result

Since the p-value is less than 0.05, we reject the null hypothesis in favour of alternate hypothesis.