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A consumer's right protection group suspects that local shopkeeper's 10g packs is actually less than wt. The group took sample of 40 whose mean wt is 9.95 and s.d. of 0.15. Find p-value for the tes
A sample of 110 is taken from a normal population which has a mean of 471 and a standard deviation of 31. The sample mean is at the 5th percentile for the SDSM? What is the sample mean? Give your an
In the autumn of 2003, the National Safe Kids Campaign conducted a study of helmet use among children ages 5 to 14 who participate in wheel sports. Was the study an experiment or an observational st
5000 light bulbs each with an average life of 500 hours, standard deviation is 100 hours. find the percentage of bulbs that can be expected to last between 540 hours and 780 hours
Roll a balanced 8-sided dice and a balanced 6 sided die and add the spots on the up-faces . Call the sum X. What is the probability distribution of the random variable X.
The concentration for each specimen, using both the proposed method and the current method. Do these two samples represent dependent or independent samples? Explain.
Construct a 96% confidence interval for the mean weight of all firefighters six months after the exercise rooms were installed. Assume that σ has not changed. Does it appear that the program i
Thirty-six of the staff of 80 teachers at a local intermediate school are certified in Cardio-Pulmonary Resuscitation (CPR). In 180 days of school, about how many days can we expect that the teacher
Is this a statistically significant difference? Write the two statistical hypothesis and conduct the appropriate test with your conclusion justified.
A brand name as a 60% recognition rate. If the owner of the brand wants to verify that rate by beginning with a small sample of 5 randomly selected consumers, find the probability that exactly 3 of
What is the probability of a fatal accident over a lifetime? Explain your reasoning carefully. Hint: Assume independent events.
The Bureau of Census reports that the median family income in California during the last year was $65,000. Assign probabilities to the simple events and find P(A), P(B), P(C)
A light bulb manufacturer claimed that its light bulbs have a mean life in 800 hours. Assume the life of the light bulbs follows the normal distribution. A sample of 50 light bulbs reveled that the
Assume the body temperature of healthy adults are normally distributed with a mean of 98.20F and a standard deviation of 0.62F. a) If you have a body temperature of 99.00F what is your percentile sc
Assuming the amount of fill is normally distributed, what is the probability that the next randomly checked bottle contains more than 32.02oz.?
A survey of consumers at a trade show employing a female spokesperson determined that 78 out of 200 customers preferred the product, while 56 of 180 customers preferred the product when a male spok
Suppose a population distribution of SAT scores has mean 504 and standard deviation 111. A sample of size 1000 is obtained from this population. What is the mean of the sampling distribution of the
Of those mountain climbers who attempt Mt. McKinley only 65% reach the summit. In a random sample of 16 mountain climbers who are going to attempt Mt. McKinley what is the probability of each of th
Servings of water is approximately normally distributed with a standard deviation of 1.4 servings what proportion of Americans drink: More than the recommended 8 servings?
A light bulb is advertised as lasting an average of 1000 hours with a standard deviation of 150 hours. Find the probability of buying a light bulb that will last between 900 and 1050 hours.
then compute the sample average weight for the 16 parts. The probability that the mean weight of these 16 parts is more than 41 grams or less than 39 grams is?
According to the American College Test (ACT). Find the Probability that a randomly selected student has a reading ACT score less than 20.
A researcher finds that of 1,000 people who said that they attend a religious service at least once a week, 31 stopped to help a person with car trouble. Of the 1,200 people interviewed who had not
Assume the probability that a person has the desease is 0.05 for all people, independently of each other, and compute the expected number of tests necessary for each group.
Bev's Bakery specializes in sourdough bread. Construct a payoff table and determine the optimal quantity for Bev to bake each morning.