A study was done to determine the effect of the MECLR (methanol extract of C lut

Question

A study was done to determine the effect of the MECLR (methanol extract of C lutea) on the mating habits of rabbits.

Twenty male rabbits were randomly assigned to one of four groups:

Control: no MECLR or sildenafil citrate
40 mg/kg body weight of MECLR
80 mg/kg body weight of MECLR
0.5 mg/kg body weight of sildenafil citrate

The next day, each male was paired with a female rabbit, and the number of times the male tried to mount the female (“mounting frequency”) was recorded. The results are as follows:

Control rabbits: 2, 3, 3, 3, 3
40 mg/kg MECLR: 4, 5, 5, 5, 6
80 mg/kg MECLR: 6, 6, 7, 8, 8
0.5 mg/kg sildenafil: 8, 9, 11, 11, 11

Question:

A researcher wants to estimate average mounting frequency when no MECLR is given. One scientist suggests using the data for just the five rabbits in the control group, since those rabbits by definition received no MECLR. Another scientist suggests using the intercept from the regression line, since that uses more data. What is the best estimate for a 95% confidence interval for the average mounting frequency of rabbits when no MECLR is present?

A. 1.558 to 4.042

B. 2.072 to 3.594

C. 2.194 to 3.473

D. 2.245 to 3.355

E. 2.311 to 3.689

Explanation / Answer

here mean of frequency of control rabbits =2.8

std deviation =.4472

std error of mean =std deviaiton/(n)1/2 =0.4472/(5)1/2 =0.2

for (n-1=4) degree of freedom and 95% CI ; t =2.7764

tehrefore 95% confidence interval for average mounting frequency =sample mean -/+ t*Std error

=2.245 to 3.355

option D

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