Title

交ぜ書き is when a single phrase consists of 漢字 that have been substituted with かな. This practice came about from language policies pushed by the National Language Council to curb the difficulty of learning Japanese orthography.

Today, the list of characters for general use has recently been updated in light of the fact that typing has made such a list irrelevant, as well as other changes to the orthography including 交ぜ書き. Although substituting 漢字 for かな has always been at the discretion of the writer, strictly abiding by the 常用漢字表 has resulted in words commonly written half in 漢字 and half in かな in the media and official texts. 

The number of words written in 交ぜ書き is rather high, but change in public opinion toward the abandoning of 交ぜ書き as much as possible is becoming more prevalent. Because the practice is also used in the gradual implementation of 漢字 in education*, this is a facet of the writing system that will have to be dealt with on a case-by-case basis. Nevertheless, below are real examples extracted from news articles to demonstrate this phenomenon. 

*: Even this practice is being phased out by utilizing ふりがな over untaught characters.  

1. 女性に多い子宮(しきゅう)がんの一種、「子宮体がん」の治療(ちりょう)の際(さい)、がん細胞(さいぼう)が残っているかどうかを画像(がぞう)で診断(しんだん)できる検査法(けんさほう)を福井大学(ふくいだいがく)の医療(いりょう)チームが開発し、治療を終えた女性が今月、出産したと発表しました。
The medical treatment team of the University of Fukui has developed a way to examine whether cancer cells remain with image diagnosis for “cancer of the uterine body,” a kind of uterine cancer prevalent in women.
From NHK on 1/30/17.

漢字 Note: 子宮がん ＝ 子宮癌. 

2. おたふくかぜはムンプスウイルスが原因の感染症(かんせんしょう)で、主(おも)にせきなどによる飛(ひ)まつで感染し、発熱や耳の下の腫(は)れなどを引き起こします。
The mumps is an infectious disease caused by the mumps virus. Infection is mainly spread by spraying from coughing, and it induces fever and swelling under the ears.
From NHK on 1/29/17.

漢字 Note: 飛まつ ＝ 飛沫. 

3. そして、一連(いちれん)の実験中(じっけんちゅう)に、脳(のう)の中でどのように記憶が作られたのか観察(かんさつ)したところ、電気刺激(でんきしげき)の恐怖(きょうふ)の記憶と甘(あま)い水の記憶は、それぞれ脳のへんとう体(たい)と呼ばれる場所で異なる神経(しんけい)細胞の集団(しゅうだん)に蓄(たくわ)えられましたが、２つの細胞の集団が、一部で重なり合うと、両方の記憶がつながることがわかったということです。
And now during a series of experiments, after observing how memories are created inside the brain, memories of fear toward electric stimulus and memories of sweet water were each respectively collected in different neuron masses in places in the brain called amygdala, but it was fond out that when a portion the two cell masses overlap, both sets of memories are connected.
From NHK on 1/29/17.

漢字 Note: へんとう体 ＝ 扁桃体. 

4. 専門家は、ウイルスのまん延(えん)が極(きわ)めて深刻(しんこく)なレベルにあると警鐘(けいしょう)を鳴(な)らしています。
Experts are raising the alarm that the spread of the virus has reached an exceedingly severe level.
From NHK on 1/26/17.

漢字 Note: まん延 ＝ 蔓延. 

5. グループでは、あらかじめすい臓(ぞう)ができないよう遺伝子(いでんし)を操作したラットの受精卵(じゅせいらん)にマウスのｉＰＳ細胞を入れ、体内(たいない)にマウスのすい臓をもつラットを作り出すことに成功しました。
In the group, success was had in creating rats which had mouse pancreases in their bodies by injecting in advance mouse iPS cells into fertilized rat eggs, which had the genes operating the pancreas not work
From NHK on 1/26/17.

漢字 Note: すい臓 ＝ 膵臓. 

6. 事故を受けて日本バレーボール協会(きょうかい)は先月、中垣内次期監督(なかがいちじきかんとく)をけん責処分(せきしょぶん)にしています。
In response to the accident, the Japan Volleyball Association gave an official reprimand Coach Nakagai for next term last month.
From NHK on 1/30/17.

漢字 Note: けん責 ＝ 譴責. 

7. 和歌山県御坊市わかやまけんごぼうしの小中学校や幼稚園ようちえんに通かよう子どもなど７００人以上が下痢げりやおう吐となどの症状しょうじょうを訴うったえた問題で、児童じどうや生徒の便べんからノロウイルスが検出けんしゅつされたことが県の調査でわかりました。
In the case of over 700 children attending elementary schools and kindergartens of Gobo City in Wakayama City having symptoms including diarrhea and vomiting, it has been uncovered in a prefectural investigation that the norovirus has been detected in the stool of children and students.  
From NHK on 1/28/17.

漢字 Note: おう吐 ＝ 嘔吐. 

8. ２７日の判決(はんけつ)で札幌地方裁判所(さっぽろちほうさいばんしょ)の田尻克已裁判長(たじりかつみさいばんちょう)は、「凶器(きょうき)を準備して襲(おそ)ったうえ被害者(ひがいしゃ)が倒れても執(しつ)ように暴行(ぼうこう)を加(くわ)え、残虐(ざんぎゃく)で計画的(けいかくてき)な犯行(はんこう)だ」と指摘(してき)しました。
In a verdict on the 27th, Judge Katsumi Tajiri of Sapporo District Court pointed out, “on top of having prepared a deadly weapon and assaulted the victim, further acts of relentless violence were dealt even after the victim had collapsed, which is a heartless and deliberate criminal offense.”   
From NHK on 1/27/17.

漢字 Note: 執よう ＝ 執拗. 

9. うつ病びょうを発症はっしょうした元社員もとしゃいんの男性に違法いほうな長時間労働ちょうじかんろうどうをさせたとして書類送検しょるいそうけんされた大手電機おおてでんきメーカー、三菱電機みつびしでんきと当時の上司について、横浜地方検察庁よこはまちほうけんさつちょうは嫌疑不十分けんぎふじゅうぶんで不起訴ふきそにしました。
In regards to a police report having been sent to Mitsubishi Electric and the boss at said time for making a former male employee work illegal long shifts which induced depression, the Yokohama District Public Prosecutors Office has decided not to prosecute due to lack of suspicion.
From NHK on 1/27/17.

漢字 Note: うつ病 ＝ 鬱病・欝病. 

10. 会場には、犠牲者(ぎせいしゃ)１９人分のろうそくが並べられ、はじめに全員で黙(もく)とうをささげ、追悼(ついとう)しました。
At the venue, candles for the 19 victims were lined up, and all participants began by offering a silent prayer as they mourned.
From NHK on 1/26/17.

漢字 Note: 黙とう ＝ 黙祷. 

11. また、採用試験とは別に、教育委員会の人事に介入し、教育長が依頼を断るとどう喝したなどと指摘されている点については、持ち込まれた人事上の要望や意見を口頭で伝えたことは認めたものの、人事について指示したり、どう喝したりした事実はないと主張しました。
Additionally, apart from the employment examination affair, in regards to being remonstrated for interfering with the personnel affairs of the Board of Education and having blackmailed the committee whenever he Superintendent of Education denied are request among other things, although he has admitted to having orally expressed his wishes and opinions for human affairs referred to him, he insists that there is no truth in him having made any instructions regarding personal affairs or having blackmailed.

漢字 Note: どう喝 ＝ 恫喝.  

12. この中で、民間議員は、世界の経済政策の不確実性によって、日本経済も大きな影響を受ける可能性があるとして、自由貿易体制の維持・強化に貢献するとともに、変動に動じない強じんな国内経済を構築するため、引き続き賃金の上昇や働き方改革に取り組むよう提言しました。
Amidst this, congressmen in civilian occupations have recommended that effort needs to be made for continued increase in wages and revolutionizing ways of work to build a tough domestic economy that isn’t perturbed by fluctuations along with contributions to the maintenance and strengthening of free trade agreements, citing that there is a possibility of the Japanese economy being greatly affected by the uncertainty in the world’s economic policies.
From NHK on 1/25/17.

漢字 Note: 強じん ＝ 強靭.

13. イージス巡洋艦(じゅんようかん)はタグボートにえい航(こう)され、基地(きち)に戻(もど)ったということで、けが人(にん)はいませんでした。
The Aegis cruiser was towed by a tug boat and returned to the base; no one was injured.
From NHK on 2/1/17.  

漢字 Note: えい航 ＝ 曳航; けが人 ＝ 怪我人.