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Answer: A point estimate for the proportion of adults aged 18 or older who feel there is too little spending on national defense is 0.3.
Step-by-step explanation:
Given : In a poll , the sample size of adults aged 18 or older : <em>n</em>=1040
Out of them , the number of persons stated that they believe there is too little spending on national defense: <em>x</em>= 18
Let <em>p</em> be the proportion of adults aged 18 or older who feel there is too little spending on national defense.
Now , as per sample , the sample proportion of adults aged 18 or older who feel there is too little spending on national defense would be :
Since , <em>the sample proportion is the best estimate of the population proportion.</em>
Therefore, a point estimate for the proportion of adults aged 18 or older who feel there is too little spending on national defense is 0.3.