A laboratory claims that the mean sodium level, µ, of a healthy adult is 139 mEq per liter of blood. To test this claim, a random sample of 13 adult patients is evaluated. The mean sodium level for the sample is 130 mEq per liter of blood. It is known that the population standard deviation of adult sodium levels is 12 mEq. Assume that the population is normally distributed. Can we conclude, at the 0.1 level of significance, that the population mean adult sodium level differs from that claimed by the laboratory? Perform a two-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places, and round your responses as specified below. (If necessary, consult a list of formulas.) (a) State the null hypothesis H and the alternative hypothesis H. H, :0 H :0 (b) Determine the type of test statistic to use. D=0 OSO (c) Find the value of the test statistic. (Round to three more decimal places.) O
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.
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