Test the claim that the proportion of people who own cats is significantly different than 50% at the 0.01 significance level. Based on a sample of 300

sanuluy

sanuluy

Answered question

2020-11-05

Test the claim that the proportion of people who own cats is significantly different than 50% at the 0.01 significance level. 
Based on a sample of 300 people, 41% owned cats 
Hint: Multiply to obtain the number of successes
(% who owned cats)(n)(41%)(300) 
The test statistic is: ? (to 2 decimals) 
The p-value is: ? (to 4 decimals)

Answer & Explanation

rogreenhoxa8

rogreenhoxa8

Skilled2020-11-06Added 109 answers

The number of success will be: 
0.41= x300 
x=0.41  300 
x=123 
It is necessary to test the following alternative and null hypotheses:
Ho : p=0.50 
Ha : p0.50 
The z-statistic is computed as follows: 
z= p¯  p0p0(1  p0)/n= 0.41  0.500.50(1  0.50)/300= 3.118 
The required P-value can be obtained by using the standard normal table. For this case, first, find the area under the standard normal curve to the left of the z score of -3.12 (approx to two decimal places). The required area is 0 .000904. Now, this area should be doubled to reflect the nature of a two-tailed test that is 0.0018. Hence, the required P-value is 0.0018. 
As the p-value 0.0018 is less than 0.01 level of signfiicance, the null hypothesis is rejected. 
The test statistic is: -3.12(to 2 decimals) 
The p-value is: 0.0018 (to 4 decimals)

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