B$2[1$ pt$]$ Let's do a slightly different hypothesis test and let's do it in one step. Use the ttest$\_1$samp function to test the hypothesis that the mean tip percentage in the population is

$17\mathrm{.}1\%.$ Store the results of the ttest$\_1$samp function in the variable hypo$\_$results. Use hypo$\_$results and an if$-$else structure to define the variable reject$\_$or$\_$not. Again, the

variable reject$\_$or$\_$not should either be the string 'reject' or the string 'fail to reject'.

$ln[14]$:

Student's answer

hypo$\_$results $=$ None

reject$\_$or$\_$not $=$ Noneimport pandas as pd

import numpy as np

from scipy.stats import ttest$\_1$samp

import scipy.stats as stats

hypo$\_$results $=$ stats.ttest$\_1$samp$($tips$\_$df$[\text{'}$tip$\_$percentage'$],17\mathrm{.}1)$ # Test against the population mean of $17\mathrm{.}1\%$

if hypo$\_$results.pvalue $<mtext></mtext><mn>0</mn><mn>.</mn><mn>0</mn><mn>5</mn>$: # Standard significance level

reject$\_$or$\_$not $=$ 'reject'

else:

reject$\_$or$\_$not $=$ 'fail to reject'

print$($f$"$Hypothesis test result: $\{$reject$\_$or$\_$not$\}")$

#raise NotImplementedError$()$

NameError

Traceback $($most recent call last$)$

Cell In$[14],$ line $12$

$7$ from scipy.stats import ttest$\_1$samp

$9$ import scipy.stats as stats

$--->12$ hypo$\_$results $=$ stats.ttest$\_1$samp$($tips$\_$df$[\text{'}$tip$\_$percentage'$],17\mathrm{.}1)$ # Test against the population mean of $17\mathrm{.}1\%$

$15$ if hypo$\_$results.pvalue $<mtext></mtext><mn>0</mn><mn>.</mn><mn>0</mn><mn>5</mn>$: # standard significance level

$17$ reject$\_$or$\_$not $=$ 'reject'

NameError: name 'tips$\_$df$\text{'}$ is not defined

ln $[15]$:

#Hidden tests for Question B$2$ are within this cell.

You have failed this test due to an error. The traceback has been removed because it may contain hidden tests. This is the exception that was thrown:

AssertionError: Question B$2$: Your answer for reject$\_$or$\_$not does not match the official answer.