Question

I keep getting error working on my project 2 MAT 243. What am I doing wrong?

Step 3: Hypothesis Test for the Population Mean (I)

A relative skill level of 1420 represents a critically low skill level in the league. The management of your team has hypothesized that the average relative skill level of your team in the years 2013-2015 is greater than 1420. Test this claim using a 5% level of significance. For this test, assume that the population standard deviation for relative skill level is unknown. Make the following edits to the code block below:

1. Replace ??DATAFRAME_YOUR_TEAM?? with the name of your team's dataframe. See Step 2 for the name of your team's dataframe.

2. Replace ??RELATIVE_SKILL?? with the name of the variable for relative skill. See the table included in the Project Two instructions above to pick the variable name. Enclose this variable in single quotes. For example, if the variable name is var2 then replace ??RELATIVE_SKILL?? with 'var2'.

3. Replace ??NULL_HYPOTHESIS_VALUE?? with the mean value of the relative skill under the null hypothesis.

After you are done with your edits, click the block of code below and hit the Run button above.

In [3]:

import scipy.stats as st

​

# Mean relative skill level of your team

mean_elo_your_team = your_team_df['elo_n'].mean()

print("Mean Relative Skill of your team in the years 2013 to 2015 =", round(mean_elo_your_team,2))

​

​

# Hypothesis Test

# ---- TODO: make your edits here ----

test_statistic, p_value = st.ttest_1samp('your_team_df'['1420'],'92' )

​

print("Hypothesis Test for the Population Mean")

print("Test Statistic =", round(test_statistic,2)) 

print("P-value =", round(p_value,4)) 

Mean Relative Skill of your team in the years 2013 to 2015 = 1419.43

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-3-1e18b44da253> in <module>
      8 # Hypothesis Test
      9 # ---- TODO: make your edits here ----
---> 10 test_statistic, p_value = st.ttest_1samp('your_team_df'['1420'],'92' )
     11 
     12 print("Hypothesis Test for the Population Mean")

TypeError: string indices must be integers

Answer 1

From your solution, it looks like your dataframe is your_team_df

So, you have replaced ??DATAFRAME_YOUR_TEAM?? with  your_team_df

The name of the variable is elo_n

So, you have replaced ??RELATIVE_SKILL?? with 'elo_n'

The hypothesized mean is 1420. So, the syntax of st.ttest_1samp is,

test_statistic, p_value = st.ttest_1samp(your_team_df['elo_n'],1420)

You are getting type error as you are passing string value '92' where a numerical value is expected.