Object not found using excel import

I imported the excel file into R studio. And then I try to run the t.test with the below command:
t.test(male,female,var.equal = TRUE)

R kept saying error with:
Error in t.test(male, female, var.equal = TRUE) : object 'male' not found

I don't know what went wrong....


t.test(exercise$male, exercise$female,var.equal = TRUE)

Success this time. Many thanks!

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