select all that apply semantics

[sof202]

In Introduction-to-Regression-with-R.Rmd, quiz 2 states 'select all that apply'. However, you can't select more than 1 option for these questions.

cfrrRtutorials/inst/tutorials/Introduction to Regression with R/Introduction-to-Regression-with-R.Rmd

Lines 390 to 401 in b83cec6

	```{r quiz2, echo=FALSE}
	quiz(caption = "Questions on exercise above",
	question("Which of these statements are true for the relationship between weight and age? Apply a significance threshold of 0.05. Select all that apply.",
	answer("The intercept is significantly non-zero.", correct = TRUE),
	answer("Age is significantly associated with weight."), allow_retry = TRUE
	),
	question("Which of these statements are true for the relationship between BMI and age? Apply a significance threshold of 0.05. Select all that apply.",
	answer("The intercept is significantly non-zero.", correct = TRUE),
	answer("Age is significantly associated with BMI."), allow_retry = TRUE
	)
	)
	```

Technically this is fine. You can indeed 'select all that apply' as there is only one answer. However, this wording still confused some participants (as you might think both or neither option is correct).