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New soft drink is being market tested. A sample of 400 individuals participated in the taste test and 100 indicated that they like the taste. We are interested in determining if more than 21% of the population will like the new soft drink.
a. Set up the null and the alternative hypotheses.b. Determine the test statistic.c. Determine the p-value.d. At 95% confidence, test to determine if more than 21% of the population will like the new soft drink.
Were the chi-square and regression tests presented and used correctly? Could the authors' analysis be recreated?
Standard deviation of 200 units. What is the probability (area under standard normal curve) that demand will be greater than 900 units in a given month?
Suppose a t- test is being applied to find out if the population monthly expenditure mean is less than $212. The level of significance selected is 1% and 26 accounts are sampled. What is the critical value?
A random sample of 225 SAT scores has a mean of 1522. Assume that SAT scores have a population standard deviation of 300. construct a 95% confidence interval estimate of the mean SAT scores.
Evaluate this correlation. What does this correlation tell us about the relationship between these two instruments?
One of 4 bus drivers is also arbitarily selected. Let Y denote number of students on his bus. Caculate expectations of X and Y: E(X)=?
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Assume that x has a normal distribution, with the specified mean and standard deviation. Find the indicated probabilities.
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ssuming that the shipment includes 3% defectives, what is the probability that the shipment will be accepted? (Hint: Use the binomial distribution.)
A certain type of lightbulb has an average life of 500 hours with a standard deviation of 100 hours. The length of life of the bulb can be closely approximated by a normal curve.
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