Please, find a Critical value. Q3. People spend around $5 billion annually for purchase of magnets used to treat a wide

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Please, find a Critical value.
Q3. People spend around $5 billion annually for purchase of
magnets used to treat a wide variety of pains. Researchers
conducted a study to determine whether magnets are effective in
treating back pain. Pain was measured using the visual analog
scale, and the results given below are among the results obtained
in the study. Higher scores correspond to greater pain levels. a.
Use a 0.05 significance level to test the claim that those treated
with magnets have a greater mean reduction in pain than those given
a sham treatment. b. Construct the confidence interval appropriate
for the hypothesis test in part (a). Reduction in Pain Level After
Magnet Treatment: 𝑛 = 20, 𝑥̅= 0.49, 𝑠 = 0.96 Reduction in Pain
Level After Sham Treatment: 𝑛 = 20, 𝑥̅= 0.44, 𝑠 = 1.4