Average of the box equals
Four hundred draws are made at random with replacement from a box. The average of the draws is 152.4, and their SD is 18. Someone claims that the average of the box equals 150. Is this plausible?
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According to a recent survey, about 33% of Americans polled said that they would likely purchase reusable cloth bags for groceries to reduce plastic waste. Suppose 45 shoppers are interviewed a local supermarket.
A biologist wishes to estimate the effect t of an antibiotic on the growth of a particular bacterium by examining the mean amount of bacteria present per plate of culture when a fixed amount of the antibiotic is applied.
The following data show the number of individuals who admitted or did not admit the strangers (the investigators) into their homes: Helpfulness to Strangers Admitted strangers into their home Did not admit strangers into their home Big-city dwelle
Sixty-four measurements are made on the speed of light. These average out to 300.007 and the SD is 10, the units being kilometers per second. Gauss model is assumed with no bias. (a) The speed of light is estimated as__________; this estimate is l
One of Mendel's breeding trials came out as follows. Make a Chi-square test to see whether these data were fudged.
A publisher wants to estimate the mean length of time (in minutes) all adults spend reading newspapers. To determine this estimate, the publisher takes a random sample of 15 people and obtains the results below.
A researcher wishes to conduct a study on the self-esteem levels of adolescents. She believes that male adolescents have higher self-esteem than female adolescents. Self-esteem test were administered to 50 randomly selected male and 50 female adol
Samples of our students from an applied experimental design class were polled regarding the number of hours they spent studying for the last exam. All students anonymously submitted the number of hours on a 3x5 card.
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