In a study on the effects stress on behaviour in rats, 71 rats were randomly ass

Question

In a study on the effects stress on behaviour in rats, 71 rats were randomly assigned to either a stressful environment or a control (non-stressful) environment.
After 21 days, the change in weight (in grams) was determined for each rat.

The following table summarises the data on weight gain:

1.1 (.8 marks)

The means for weights of the rats under stress and under no stress can be entered as mu[1] and mu[2], respectively.

Don't be concerned if Maple/AiM rearranges the equation or inequality you enter.

1.1.1 (.4 marks)

H0 :

Your answer is correct.

The mark for your last attempt was 0.40
You previously made 7 incorrect attempts, and were penalised 0.04 for each of them, giving an overall mark of 0.12.

1.1.2 (.4 marks)

HA :

Your answer is correct.

The mark for your last attempt was 0.40
You previously made 3 incorrect attempts, and were penalised 0.04 for each of them, giving an overall mark of 0.28.

1.2 (1 mark)

Calculate the value of the t-statistic to three decimal places.
t   

Your answer is correct.

The mark for your last attempt was 1.00
You previously made 6 incorrect attempts, and were penalised 0.10 for each of them, giving an overall mark of 0.40.

1.3 (.6 marks)

Using the simple method, how many degrees of freedom df does this t-statistic have?
df =  

Your answer is not correct.

Explanation / Answer

here alll of your answer are correct except 1.3 please revert if you need help in other part

here for simple method ; degrees of freedom =minimum of sample sizes -1 =min(21,50)-1 =21-1 =20

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