Answer:
The correct option is A
Step-by-step explanation:
From the question we are told that
The population is
The level of significance is
The sample data is 9.0, 7.3, 6.0, 8.8, 6.8, 8.4, and 6.6 pounds
The Null hypothesis is
The Alternative hypothesis is
The critical value of the level of significance obtained from the normal distribution table is
Generally the sample mean is mathematically evaluated as
substituting values
The standard deviation is mathematically evaluated as
substituting values
Generally the test statistic is mathematically evaluated as
substituting values
Looking at the value of t and we see that
hence we fail to reject the null hypothesis
What this implies is that there is no sufficient evidence to state that the sample data show as significant increase in the average birth rate
The conclusion is that the mean is
