It is believed that the percentage of people who support candidate a is 56%. a sample of size 100 indicated that 40 people support candidate a. is there evidence at an alpha level of 10% to conclude that the percentage of people who support candidate a has changed?

Given data:

Sample size

Sample proportion of people support candidate A:

Population proportion of people support Candidate A :

Check the condition: and

Null Hyposthesis:

Alternative Hypothesis:

The test statistics:

Plug in p=0.56, P=0.40 and n=100 in the above formula,

The table value of z at 10% of significance level is 1.28

Table value is less than the calculated value.

Hence is rejected at 10% level.

Therefore there is the evidence at an alpha level of 10% to conclude that the percentage of people who support candidate A has changed.

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step-by-step explanation: