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Conduct a one-tailed hypothesis test given the information below.
A certain brand of Green Energy light bulbs was advertised as having an average illumination life-span of 2,500 hours. A random sample of 50 bulbs burned out with a mean life-span of 2,470 hours and a sample standard deviation of 140 hours. With a 0.05 level of significance, is the sample mean less than the advertised mean?
Two types of flares are tested for their burning times (in minutes) and sample results are given below.
Suppose a fair coin is tossed n times. The probability of obtaining head and tail are the same because this is a fair coin. The proportion of heads is defined as the number of heads appeared divided by n.
Estimate the probability the store will gross over $850 a) Fewer than 5 out of 10 business days.
The management of a regional bus line thought its cost of gas might be correlated with its passenger/mile ratio. Comment on the data and correlation matrix below.
An experiment consists of selecting a card at random from a 52-card deck. Refer to this experiment and find the probability of the event.
Choose the proper conclusion regarding the claim that the population have different variances.
What the information do z-scores give that actual heights do no?
One use of the Chi-square goodness of fit test is to determine if specified multinominal probabilities in the null hypothesis is correct.
Findout probabilities utilizing standard normal distribution. If the debt is normally distributed with a standard deviation.
Create a 90% confidence interval for mean score on this placement exam for all students.
What measurements assesses the amount of variance of change in the dependent variable reflected by changes in the independent variable?
Give all steps of a test of the hypothesis that the corresponding population proportions are equal.
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