Fill This Form To Receive Instant Help
Fill This Form To Receive Instant Help
Homework answers / question archive / Two drugs were being compared for effectiveness in a randomized control trial
Two drugs were being compared for effectiveness in a randomized control trial. Participants for both groups were selected so that each had a BMI of 32 and age of 35 years old at the beginning of the trial.
The diets were strictly enforced to be equal and each participant was allowed to exercise 30 minutes per day during the 12 week
trial period. Each trial began with 50 participants
For the 43 people in drug A's group, the average weight loss was 12.3 lbs with a sample standard deviation of 4.2 lbs.
In group B the 41 who finished the trial ended up with an average weight loss of 11.4 lbs and a standard deviation of 3.2 lbs.
State the alternative hypothesis for this experiment.
Which of the following are not assumptions needed to apply the independent samples t-test for this problem?
Group of answer choices
At least 10 successes and failures in each group
Independent sampling within the groups
Independent sampling between the groups
No outliers in either group
Each group must not be heavily skewed
Sigma must be known
Step-by-step explanation
State the alternative hypothesis for this experiment.
Here we want to test whether the two drugs were being compared for effectiveness in a randomized control trial or they have same effect.
So the null and alternative hypothesis are as follows:
Null hypothesis, H0: µ1 = µ2
Alternative hypothesis, H1: µ1 ≠ µ2
Which of the following are not assumptions needed to apply the independent samples t-test for this problem?
There are three main assumption for independent samples t-test.
1) Independence: both the groups are independent and the sample are randomly selected from the population.
From this assumption, we require
Independent sampling within the groups
Independent sampling between the groups
2) Normality: The data is comes from the normal distribution.
From this we required
No outliers in either group
Each group must not be heavily skewed.
3) Homogeneity of Variance
The variances of each samples are homogeneous.
So from the given options, we do not need
"At least 10 successes and failures in each group" and "Sigma must be known" these assumptions".
Answer:
At least 10 successes and failures in each group and
Sigma must be known" these assumptions.
