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Question: You don't have a population standard deviation but you have sample data. Calculate a sample mean and standard deviation and use the sample standard deviation value to complete the inferential test. And the sample size is < 30 so this uses a students t test. ( uses the same 5 steps as does a Z test but you have a different method of finding the critical value A friend of mine works part-time as a waitress. Recently a local mid-scale restaurant tried to hired her telling her that she would average 75$ a night in tips. So she started work there and for 15 (n = 15) random days collected her tip money. Below is the data. Test at the 0.05 alpha, 1 tail test to determine if they told her the truth, or did she make less or more statistically?Data : 62, 83, 78, 91, 69, 73, 79, 82, 50, 79, 81, 79, 71, 79, 75
What are the similarities between dividing two fractions and dividing two rational expressions?
Setermine the probability that a specific driver had exactly two violations?
The standard deviation of the sample is $3,000. Interpret your findings.
To check this theory, 20 invoices are randomly selected and 5 are found to have errors. What is the probability that of the 20 invoices written, five or more would contain errors if the theory is valid?
A food snack manufacturer samples 13 bags of pretzels off the assembly line and weighs their contents. If the sample mean is 14.7 oz. and the sample standard deviation is 0.50 oz., find the 95% confidence interval of the true mean.
Explain why the sequence is important. What might happen if the hypothesis test is performed before the researcher has decided on the significance level?
Let z represent the standard normal variable and suppose a value is randomly selected. Find each of the following probabilities by:
Choose a variable. Before collecting the data, decide what a likely average might be, then complete the following: Write a brief statement of purpose of the study
At the 5% level do the data provide sufficient evidence to conclude that the mean time served for fraud is less than that for firearms offenses? Identify the appropriate test and test the claim using the traditional method at the 0.05 level of sig..
Ann and Jim, two employees in a fast-food restaurant, play the following game while waiting for customers to arrive: Jim pays Ann 2 cents if the next customer does not arrive within 1 minute; otherwise, Ann pays Jim 2 cents. Determine Jim's averag..
At the .10 level of significance, is the coin biased toward heads? Show your decision rule and calculations.
The moment generating function of normal distributed random variable ,Y, with mean and variance .derive the moment generating function of X=-3Y+4.what is the distribution of X? why?
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