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It is known that higher blood oxygen concentration leads to higher athletic performance. Wim Hof claims his breathing technique increases blood oxygen concentration. To test this claim, 26 athletes were randomly selected. 40 minutes before the competition each athlete's blood oxygen concentration was measured and each athlete was directed to perform the Wim Hof breathing technique for 15 minutes. 20 minutes before the compeition each athlete's blood oxygen concentration was measured again Results:

`hat(\mu )_(C)=0.31;S_(C)^(2)=0.36;hat(P)=0.94`

What is the test situation? What is the null hypothesis? (Check all that apply) the Wim Hof breathing technique increased the true average blood oxygen concentration the true average change of blood oxygen concentration is zero the true average change of blood oxygen concentration is less than zero the true average change of blood oxygen concentration is greater than zero the Wim Hof breathing technique decreased the true average blood oxygen concentration the Wim Hof breathing technique did not change the true average blood oxygen concentration What is the alternative hypothesis? (Check all that apply) the Wim Hof breathing technique decreased the true average blood oxygen concentration the true average change of blood oxygen concentration is zero the true average change of blood oxygen concentration is greater than zero the true average change of blood oxygen concentration is less than zero the Wim Hof breathing technique increased the true average blood oxygen concentration the Wim Hof breathing technique did not change the true average blood oxygen concentration What is(are) the critical value(s)? If there is only one critical value enter the same value in the second box. What is the statistical decision? Accept the HO Accept the HA Fail to reject the HO Fail to reject the HA Reject the HA Reject the HO What is the interpretation? (Check all that apply) I conclude that the Wim Hof breathing technique increased the true average blood oxygen concentration. I conclude that the true average change of blood oxygen concentration is zero. Specifically, I predict that the Wim Hof breathing technique increased the true average blood oxygen concentration by

`0.31m(L)/(L)`

I conclude that the Wim Hof breathing technique increased the true average blood oxygen concentration. Specifically, I predict that the Wim Hof breathing technique increased the true average blood oxygen concentration by

`0.31m(L)/(L)`

I conclude that the Wim Hof breathing technique did not change the true average blood oxygen concentration. I conclude that the Wim Hof breathing technique did not change the true average blood oxygen concentration. Specifically, I predict that the Wim Hof breathing technique decreased the true average blood oxygen concentration by

`0.31m(L)/(L)`

I conclude that the true average change of blood oxygen concentration is zero. I conclude that the true average change of blood oxygen concentration is zero. Specifically, I predict that the Wim Hof breathing technique decreased the true average blood oxygen concentration by

`0.31m(L)/(L)`

I conclude that the true average change of blood oxygen concentration is less than zero. I conclude that the Wim Hof breathing technique did not change the true average blood oxygen concentration. Specifically, I predict that the Wim Hof breathing technique increased the true average blood oxygen concentration by

`0.31m(L)/(L)`

I conclude that the true average change of blood oxygen concentration is less than zero. Specifically, I predict that the Wim Hof breathing technique decreased the true average blood oxygen concentration by

`0.31m(L)/(L)`

I conclude that the true average change of blood oxygen concentration is greater than zero. I conclude that the true average change of blood oxygen concentration is greater than zero. Specifically, I predict that the Wim Hof breathing technique increased the true average blood oxygen concentration by

`0.31m(L)/(L)`

I conclude that the Wim Hof breathing technique decreased the true average blood oxygen concentration. Specifically, I predict that the Wim Hof breathing technique decreased the true average blood oxygen concentration by

`0.31m(L)/(L)`