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. Because \( \mathrm{np}_{0}\left(1-\mathrm{p}_{0}\right)=\square \) 10, the sample size is (Round to one decimal place 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?

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.

A researcher risks a Type I error: anytime HO is rejected. anytime H 1 is rejected. anytime HO is accepted. anytime the sample size is increased.

A researcher rejects the null hypothesis only if the obtained statistical results show: that it is likely that the null is true. that it is unlikely that the null is true. that it is likely that the alternative hypothesis is false. that is unlikely that the alternative hypothesis is false.