Determination of sample size depends on: I. sample varianceII. populat..
Determination of sample size depends on: I. sample variance II. population standard deviation III. degree of confidence IV. maximum error of estimate => II and III only or all of the above or II, III and IV only or I, III and IV only..
The mean number of candies in a packet is 175, with a standard deviati..
The mean number of candies in a packet is 175, with a standard deviation of 5 candies. A random sample of 70 packets from a certain shipment has a mean of 174.2 candies. Which of the following statements is true? 1.The null hypothesis is accepted. 2..
A machine produces bolts, of which 10% are defective. Find the probabi..
A machine produces bolts, of which 10% are defective. Find the probability that in a random sample of 400 bolts produced by the machine, 55 or more will be defective. Assume a standard deviation of 6. => 0.970 or 0.0079 or 0.079 or 0.0097..
The amount of magazine sales (in million dollars) for a sample of 7 ye..
The amount of magazine sales (in million dollars) for a sample of 7 years are 2.6, 1.8, 2.0, 3.2, 1.6, 3.4, 2.3. Find the sample variance and sample standard deviation. => 1.066 and 1.136 or 0.475 and 0.689 or 1.136 and 1.066 or 2.113 and 1.45..
Standard Deviation for continuous series
In this series too deviations may be taken either from the actual mean or from standard mean. The calculations will be simplified if the deviation are taken from assumed mean..
Standard Deviation for continuous series
In this series too deviations may be taken either from the actual mean or from standard mean. The calculations will be simplified if the deviation are taken from assumed mean..
A gas lighter manufacturer claims that the lifespan of his gas lighter..
A gas lighter manufacturer claims that the lifespan of his gas lighter has a mean of 48 months and a standard deviation of 6 months. A sample of 50 gas lighters are tested by a consumer advocacy group. Assuming the manufacturer's claims are true, what is the ..
A nutritionist claims that the number of calories in one table spoon o..
A nutritionist claims that the number of calories in one table spoon of the major brands of pancake syrup is 180. A sample of 18 major brands of syrup is selected and found that the mean number of calories in one tablespoon of syrup is 156 with a standard deviatio..
A four year public college or university charged a tuition fees of $10..
A four year public college or university charged a tuition fees of $10,903 in the year 2000, on an average. In 2001, a random sample of 10 four year public colleges or universities had a mean of $11,418 with a standard deviation of $650. At α = 0.01, fi..
A cement manufacturer claims that the maximum final setting time of ce..
A cement manufacturer claims that the maximum final setting time of cement is 10 hours. A sample of 13 bags were tested and found that the mean of the maximum final setting time was 11.2 hours with a standard deviation of 1.8 hours. At α = 0.01, can the..
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