Biostat

RUNNING HEADER: BIOSTAT 1
Biostat
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Biostat 2
Question 1
a)
The average grip strength has a 95% confidence interval in the population that is between is
31.47 and 32.32. Hence, we are 95% confident that the average grip strength in the
population of grandparent carers in Parramatta is between 31.47 and 32.32.
b)
We choose to not reject the claim that the mean grip strength of grandparent carers in
Parramatta is significantly different from 33kgs at 0.05 significance level. This is because the
test statistics of -4.3 is less than the critical value of -1.6.

Biostat 3
c)
Step 1: Assumptions
The most appropriate method used was a Welch two sample t-test. The method is the most
suitable since the assumption made is that there are two populations which have equal means.
Step 2: Hypothesis
The null hypothesis states that the average grip strength is equal between females and males
in the population of grandparent carers in Parramatta while the alternative hypothesis states
that there is a difference.
Step 3: Sampling distribution
Male average = 32.01
Female average = 31.77
Step 4: test statistic
t (t statistics) = -0.458
df (degree of freedom)= 222.06
p (p-value) = 0.6473
Step 5: Decision
The decision is to accept the null hypothesis since p > 0.05. Hence, the mean grip strength is
equal between females and males in the population of grandparent carers in Parramatta