91影视

The dot plot depicts the result of taking $200$ SRSs from $60$ kids from a population with a real proportion of $0.50$ brushing with the water off.

We can't foresee the outcomes of a chance process, yet they have a regular distribution over a large number of repetitions. According to the law of large numbers, the fraction of times a specific event occurs in numerous repetitions approaches a single number. The likelihood of a chance outcome is its long-run relative frequency. A probability is a number between $0$ (never happens) and $1$ (happens frequently) (always occurs).

Because $27$ out of $60$ kids answered "No," it does not provide persuasive proof that more than half of the school's students recycle $27/60=0.45$ We can see that the proportion of $0.45$ has a lot of dots above it in the dot plot. Thus, a proportion of $0.45$ is quite likely to be obtained when the true proportion is $0.5$, and there is insufficient evidence to support the assertion that more than half of the school's students wash their teeth with the water turned off.

Because $18$ out of $60$ kids answered "Yes," this statistic strongly suggests that the majority of the school's students recycle $18/60=0.3$We can see that the proportion of $0.5$ has no dot above it and no dots to the left of it in the supplied dot plot. Thus, when the genuine proportion is $55$, it is extremely likely to achieve a proportion of $0.3$, and there is adequate evidence to support the assertion that more than half of the school's students brush their teeth with the water turned off.