Twenty years ago, \( 46 \% \) of parents of children in high school felt it was a serious problem that high school students were not being taught enough math and science. A recent survey found that 284 of 900 parents of children in high school felt it was a serious problem that high school students were not being taught enough math and science. Do parents feel differently today than they did twenty years ago? Use the \( \alpha=0.05 \) level of significance. Find the P-value. P-value \( =\square \) (Round to three decimal places as needed.)

If we say that we have statistically significant results, we mean that the results are: very important. meaningless. likely to be due to chance differences between to be due to true differences between the groups.

Die Erdbevölkerung betrug 1960 3.0 Milliarden, 20046.4 Milliarden. a) Wie viel betrug die mittlere jährliche Zunahme (in Prozent)? b) Gleiche Zunahme vorausgesetzt: Wie viele Menschen würden im Jahre 2050 die Erde bevölkern? c) Ein UNO-Bericht rechnet für 2050 mit einer Bevölkerungszahl von 8.9 Milliarden. Berechnen Sie die mittlere jährliche Zunahme ab 2004. d) Die 50 ärmsten Länder werden, gemäss Prognose, von 600 Millionen 2004 auf 1.7 Milliarden 2050 wachsen. Welche mittlere jährliche Zunahme ab 2004 wird hier erwartet?

By selecting a smaller alpha level, a researcher is: attempting to make it easier to reject the null (HO). attempting to make it easier to reject the alternative (H1). reducing the risk of a Type I error. attempting to decrease the standard error.

A design that has two conditions (treatments) with the same participants experiencing each condition is a(n): two independent groups design. repeated measures design. Analysis of Variance (ANOVA) design. single sample t test design. single sample Z test design.

The probability of committing a Type I error: is solely determined by the size of the treatment effect. cannot be controlled by the experimenter. is determined by the alpha (a) level that one chooses. is determined by the beta ( \( \beta \) ) level one chooses. is determined by the sample size that one chooses.