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Precision measurements often vary according to a normal distribution when repeated. The mean equal to the "true value" of the measurement if the instrument has no bias. The standard deviation of the measurements depends on the precision of the instrument. Suppose that a laboratory scale has standard deviation σ = 0.01 grams in repeated weighings of the same quantity. A student weighs a compound 5 times on this scale. The sample mean of these 5 measurements is 2.01 grams. The theory in the chemistry text says that the result is supposed to be exactly 2 grams. You want to determine if the sample result gives good evidence that the true amount of the compound is not equal to 2 gms. Carry out the test, find the P-value, and state your conclusion.
At the 0.05 significance level, can he conclude that number of absences has declined? calculate approximately the p -value.
As of 2012, the proportion of students who use a MacBook as their primary computer is 0.36. You believe that at your university the proportion is actually greater than 0.36. If you conduct a hypothesis test, what will the null and alternative hypo..
Recognize the kind of sampling (random, systematic, convenience, stratified, cluster) employed whenever a sample of people who smoke is obtained as explained below.
Assume the population is normally distributed, the confidence level is 95%, n = 12, and σ is unknown.
Walleye is a common game fish. Adult walleye have a length with a mean of 44 cm and a standard deviation of 4 cm and the distribution of lengths is approximately Normal. What fraction of walleye are between 40 and 48 cm in length?
Determine the probability that employee will make 28 or more sales during 100-call shift? Allocate a Random Variable x.
He surveys several businesses and finds the standard deviation in monthly advertising costs is $23 for 12 hair salons, and $43 for 8 nail salons.
Determine the probability of examining a sample mean weight from any 20 women chosen from this population that is less than S (your sample mean) by using population standard deviation?
To speed up the process in a blood testing procedure, blood samples from 3 people are combined into one mixture. The mixture will only test negative if all the individual samples are negative.
Would you play this game if you wanted to make money? What do we expert the value of the results of the game to be?
What is the null hypothesis? What is your decision if a = 0.01?
Finding the probability value for the given data using normal approximation
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