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Assume a normal distribution applies and alpha = 0.05 (Use Z table), find the Critical value for the alternative hypothesis:
H1: The population mean does not equal 0.18
Statistics and Probability, Statistics
Average sales for an online textbook distributor were $74.67 per customer per purchase. Assume the sales are normally distributed. If the standard deviation of the amount spent on a textbooks is $9.49, find these probabi ...
Choose the correct problem formulation: It is known that 70% of the customers in a sporting goods store purchase a pair of running shoes. A random sample of 25 customers is selected. Assume that customers' purchases are ...
42% of the cars in a dealer lot are red, 21% are black and 10% are white. The remainder are some other unspecified color. Salespersons randomly shows three cars to three different customers. What is the probability the f ...
A professor determines that 95% of her students prefer getting weekly homework assignments to solving two in-class problems at the end of the semester. What is the probability that a particular student prefers solving in ...
The average starting salary for graduates at a university is $33,000 with a standard deviation of $2,000. If a histogram of the data shows that it takes on a mound shape, the empirical rule says that approximately 68% of ...
I. A statistics instructor wants to measure the effectiveness of his teaching skills in a class of 66 students ( N = 66). He selects students by waiting at the door to the classroom prior to his lecture and pulling asid ...
A car gets involved in an accident 80% of the time if it is defective. If it is not defective, the probability reduces to 40%. 30% of all cars are defective. If a car is involved in an accident, what is the probability t ...
SmithCo is a supplier to many brand name makers of mobile phones. SmithCo manufactures the external shells that enclose mobile phones. The strength of a shell is measured by applying increasing pressure to the shell and ...
The weight of the eggs produced by a certain breed of hen has an unknown distribution with a mean of 65 grams and a standard deviation of 5 grams. If you purchase 144 eggs, what is the approximate probability that the av ...
The probability of someone ordering the daily special is 52%. If the restaurant expected 96 people for lunch, how many would you expect to order the daily special?
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