The security department of a factory wants to knowwhether the true average time required by the night guard to walk his round is 30 minutes. If, in a ran-dom sample of 32 rounds, the night guard averaged 30.8 minutes with a standard deviation of 1.5 minutes, deter-mine whether this is sufficient evidence to reject the null hypothesis μ = 30 minutes in favor of the alternative hypothesis μ Z 30 minutes. Use the four steps in the ini-tial part of Section 1 and the 0.01 level of significance.
Unitary Method
The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products.
Speed, Time, and Distance
Imagine you and 3 of your friends are planning to go to the playground at 6 in the evening. Your house is one mile away from the playground and one of your friends named Jim must start at 5 pm to reach the playground by walk. The other two friends are 3 miles away.
Profit and Loss
The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.
Units and Measurements
Measurements and comparisons are the foundation of science and engineering. We, therefore, need rules that tell us how things are measured and compared. For these measurements and comparisons, we perform certain experiments, and we will need the experiments to set up the devices.
The security department of a factory wants to know
whether the true average time required by the night
guard to walk his round is 30 minutes. If, in a ran-
dom sample of 32 rounds, the night guard averaged 30.8
minutes with a standard deviation of 1.5 minutes, deter-
mine whether this is sufficient evidence to reject the null
hypothesis μ = 30 minutes in favor of the alternative
hypothesis μ Z 30 minutes. Use the four steps in the ini-
tial part of Section 1 and the 0.01 level of significance.
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