Question

1.Using an appropriate statistical test decide whether you can accept or reject your null hypothesis regarding the hiv.csv data from the lab test exercise with an alpha of 0.05.

Select one:

a. Accept

b. Reject

2.Calculate the lower value (2dp) of a 95% confidence interval from the hiv.csv data from the lab test exercise.

3.Using a Shapiro-Wilks normality test, decide whether you can accept or reject the assumption of normality of a parametric test with the hiv.csv data from the lab test exercise and an alpha of 0.05.

Select one:

a. Reject

b. Accept

4.What is the correct alternative hypothesis for the hiv.csv data in the lab test exercise?

Select one:

a. Mean time taken for white blood cells to replenish to healthy levels is not significantly different from 0

b. The mean is signficantly different from 56.71

c. Mean time taken for white blood cells to replenish to healthy levels is not significantly different from 56.71 days

d. Mean time taken for white blood cells to replenish to healthy levels is significantly different from 56.71 days

hiv.csv

time
22
2
48
85
160
238
56
94
51
12
171
80
180
4
90
180
3

Answer 1

> X=c (22,2, 48,85, 160,238, 56,94, 51, 12, 171, 80, 180, 4, 90, 180, 3) > length (X) [1 17 > ##1) WE use t test tp analyze > t.test (X) One Sample t-test data x t 4.8438, df16, p-value 0.0001796 alternative hypothesis: true mean is not equal to o 95 percent confidence interval: 48.82481 124.82225 sample estimates: mean of x 86.82353 > # P value is less than level of significance. REJECT HO > ##2) Lower value > Xbar=mean (X) >SE-sd (X)/sqrt (17) > Tcrit=2.1098 > Lower value-bar-TcrítkSE > Lower Value 1 49.00594

> ##3) Shapiro test > shapiro.test (X) Shapiro-Wilk normality test data: X W0.9064, p-val ue-0.08698 > Here P value is greater than 0.05. Accept > ##4) Answer is B