Before thinking about changing the model, a first step should be to check for any easy mistakes made in the Stan code. The Stan compiler has a pedantic mode to help spot such issues.$$By default the pedantic mode is not enabled, but we can use option$$pedantic $=$ TRUE$$at compilation time, or after compilation with the$$check$\_$syntax$$method$.$

$3\mathrm{.}4$: Use the function $[$Stan model$]$$check$\_$syntax$($pedantic $=$ TRUE$).$ What warning message$($s$)$ do you get?

Multiple choice $34$ Question $1$

That only the alpha parameter has a prior specified

That none of the parameters in the model have priors specified

That only the beta parameter has a prior specified

$3\mathrm{.}5$: Set normal$(0,10)$ priors for both parameters, what do you find from the MCMC output?

Multiple choice $35$ Question $1$

No issues with NUTS and convergence diagnostics

Some issues with NUTS diagnostics but no convergence issues

No issues with NUTS diagnostics but some convergence issues