Question

A genetic experiment with peas resulted in one sample of offspring that consisted of 435 green peas and 163 yellow peas.Given that the percentage of offspring yellow peas is not 25%, do the results contradict expectations

Answer 1

a

The estimate for the percentage of yellow peas lie within the confidence interval 23.66% and 30.83 %

b

Since the expected value for the estimate of the yellow peas lies between the confidence interval it means that the given estimate of yellow peas does not contradict the expectation

Explanation:

From the question we are told that

The number of green peas is
`g = 453`

The number of yellow peas is
`y = 163`

The sample size is
`n = y + g = 435 + 163 = 598`

The sample proportion of the yellow peas is
`\r p_y = (y)/(n)`

substituting values

`\r p_y = (163)/(598)`

`\r p_y = 0.2726`

Given that the confidence level is
`c = 95`%

The level of significance is
`\alpha = 100 - 95 = 5`%

The critical values at this level of significance is obtained from the table of critical values as

`t_(\alpha ) = 1.960`

Now the confidence interval is mathematically evaluated as

`k = \r p _y \pm t_(\alpha ) \sqrt{(\r p (1 - \r p) )/(n) }`

substituting values

`k =0.2726 \pm 1.96 \sqrt{(0.2726 (1 - 0.2726) )/(598) }`

`k =0.2726 \pm 0.036`

So the 95% confidence interval is

k = ( 0.2366, 0.3083)

This mean that the estimate of the yellow peas(25%) lies between

23.66% and 30.83 %

Given that the expected value for the estimate of the yellow peas lies between the confidence interval it means that the given estimate of yellow peas does not contradict the expectation